feat(deps): upgrade transitive dependencies

* `earmark_parser` from 1.4.43 to 1.4.44
* `makeup` from 1.1.2 to 1.2.1
* `makeup_elixir` from 0.16.2 to 1.0.1
* `makeup_erlang` from 1.0.1 to 1.0.2
* `plug` from 1.16.1 to 1.17.0
* `saxy` from 1.5.0 to 1.6.0

Makefile

@@ -27,11 +27,15 @@ credo:  ## run credo
 
 .PHONY: dialyzer
 dialyzer:  ## run dialyzer
-	@mix dialyzer --no-check --quiet --ignore-exit-status --format short
+	@mix dialyzer --format short
 
 .PHONY: static_code_analysis
 static_code_analysis: check_format check_compile credo dialyzer  ## run static code analysis
 
+.PHONY: docs
+docs:  ## create documentation files
+	@mix docs
+
 .PHONY: test
 test:  ## run tests
 	@mix test --cover --trace --slowest 10

config/test.exs

@@ -1,5 +1,8 @@
 import Config
 
+config :wabanex, Growth.Indicators.Download,
+  who_req_options: [plug: {Req.Test, Growth.Indicators.Download.WHO}]
+
 config :wabanex, Wabanex.Repo,
   database: "wabanex_test#{System.get_env("MIX_TEST_PARTITION")}",
   pool: Ecto.Adapters.SQL.Sandbox

lib/growth/calc/age.ex

@@ -0,0 +1,48 @@
+defmodule Growth.Calc.Age do
+  @moduledoc """
+  Calculate the age in months.
+  """
+
+  @type precision :: :day | :week | :month | :year
+
+  # NOTE: (jpd): based on [WHO instructions][0]
+  # [0]: https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/instructions-en.pdf
+  @day_in_month 30.4375
+
+  @day_in_week 7.0
+
+  @doc """
+  Calculate the age with the precision of `:day`, or `:week`, or `:month`, considering the measurement date as today.
+
+  For age in weeks or months, considers completed ones, removing decimal value.
+  """
+  @spec calculate(precision(), Date.t(), Date.t()) :: pos_integer()
+
+  def calculate(precision, date_of_birth) do
+    calculate(precision, date_of_birth, Date.utc_today())
+  end
+
+  @doc """
+  Calculate the age with the precision of `:day`, or `:week`, or `:month`.
+
+  For age in weeks or months, considers completed ones, removing decimal value.
+  """
+
+  def calculate(:month, date_of_birth, date_of_measurement) do
+    :day
+    |> calculate(date_of_birth, date_of_measurement)
+    |> Kernel./(@day_in_month)
+    |> floor()
+  end
+
+  def calculate(:week, date_of_birth, date_of_measurement) do
+    :day
+    |> calculate(date_of_birth, date_of_measurement)
+    |> Kernel./(@day_in_week)
+    |> floor()
+  end
+
+  def calculate(:day, date_of_birth, date_of_measurement) do
+    Date.diff(date_of_measurement, date_of_birth)
+  end
+end

lib/growth/calc/bmi.ex

@@ -0,0 +1,29 @@
+defmodule Growth.Calc.BMI do
+  @moduledoc """
+  Calculate body mass index
+  """
+
+  @inch_to_centimeter 2.54
+  @pound_to_kilogram 0.453592
+
+  @doc """
+  Calculate the body mass index for a given weight and height.
+
+  Measurements taken in english unit (pounds and inches) are converted to their metric equivalents (kilograms and centimeters).
+  """
+  @spec calculate(:english | :metric, number, number) :: number
+
+  def calculate(:english, weight, height) do
+    metric_weight = pound_to_kilogram(weight)
+    metric_height = inches_to_centimeters(height)
+    calculate(:metric, metric_weight, metric_height)
+  end
+
+  def calculate(:metric, weight, height) do
+    weight / :math.pow(height / 100.0, 2)
+  end
+
+  defp inches_to_centimeters(height), do: height * @inch_to_centimeter
+
+  defp pound_to_kilogram(weight), do: weight * @pound_to_kilogram
+end

lib/growth/calc/centile.ex

@@ -0,0 +1,45 @@
+defmodule Growth.Calc.Centile do
+  @moduledoc """
+  Calculate the value of measurement at a given z-score and fitted values of Box-Cox by age/height:
+
+  * **power** `t:Growth.Calc.ZScore.l/0`
+  * **median** `t:Growth.Calc.ZScore.m/0`
+  * **coefficientof variation** `t:Growth.Calc.ZScore.s/0`
+
+  This calculation is described in the [instructions provided by the World Health Organization](https://cdn.who.int/media/docs/default-source/child-growth/growth-reference-5-19-years/computation.pdf).
+
+  ## Examples:
+
+      iex> measures =
+      ...>   [
+      ...>     [-3.0, -1.7862, 16.9392, 0.1107],
+      ...>     [2, -1.3592, 20.4951, 0.12579],
+      ...>     [-1.2, -1.6318, 16.049, 0.10038]
+      ...>   ]
+      iex> Enum.map(measures, &apply(Growth.Calc.Centile, :compute, &1))
+      [13.05127032828574, 27.884359024082663, 14.37765739914362]
+
+  """
+
+  alias Growth.Calc.ZScore
+
+  @spec compute(number(), ZScore.l(), ZScore.m(), ZScore.s()) :: number() | :na
+  @doc """
+  Compute the measurement value for a given z-score and the Box-Cox values: power (`l`), median (`m`), and coefficient of variation (`s`).
+
+  Returns the measurement based on the z-score when -3 <= z-score <= 3; otherwise, `:na.`
+
+  ## Examples:
+
+      iex> Growth.Calc.Centile.compute(0.0, -1.6318, 16.049, 0.10038)
+      16.049
+
+  """
+  def compute(z_score, l, m, s) when -3 <= z_score and z_score <= 3 do
+    m * :math.pow(1 + l * s * z_score, 1 / l)
+  end
+
+  def compute(_z_score, _l, _m, _s) do
+    :na
+  end
+end

lib/growth/calc/percentile.ex

@@ -0,0 +1,30 @@
+defmodule Growth.Calc.Percentile do
+  @moduledoc """
+  Convert the z-score of a given measurement into a cumulative percentile.
+
+  This calculation is described in the [cumulative distribution function][https://en.wikipedia.org/wiki/Error_function#Cumulative_distribution_function].
+
+  ## Examples
+
+    iex> z_scores = [-1.0, 0.0, 1.0]
+    iex> Enum.map(z_scores, &apply(Growth.Calc.Percentile, :compute, [&1]))
+    [0.15865525393145707, 0.5, 0.8413447460685429]
+
+  """
+
+  @doc """
+  Convert the z-score of a given measurement into a percentile representation, ranging from 0 to 1.
+
+  ## Examples
+
+    iex> Growth.Calc.Percentile.compute(2.0)
+    0.9772498680518208
+    iex> Growth.Calc.Percentile.compute(-2.0)
+    0.02275013194817921
+
+  """
+  @spec compute(number()) :: number()
+  def compute(z_score) do
+    0.5 * (:math.erf(z_score / :math.sqrt(2)) + 1)
+  end
+end

lib/growth/calc/z_score.ex

@@ -0,0 +1,116 @@
+defmodule Growth.Calc.ZScore do
+  @moduledoc """
+  Calculate z-score for a given measurement and the fitted values of Box-Cox by age/height:
+
+  * **power** `t:l/0`
+  * **median** `t:m/0`
+  * **coefficientof variation** `t:s/0`
+
+  This calculation is described in the [instructions provided by the World Health Organization](https://cdn.who.int/media/docs/default-source/child-growth/growth-reference-5-19-years/computation.pdf).
+
+  ## Examples:
+
+      iex> measures =
+      ...>   [
+      ...>     [30, -1.7862, 16.9392, 0.1107],
+      ...>     [14, -1.3592, 20.4951, 0.12579],
+      ...>     [19, -1.6318, 16.049, 0.10038]
+      ...>   ]
+      iex> Enum.map(measures, &apply(Growth.Calc.ZScore, :compute, &1))
+      [3.35390255606726, -3.7985108865993493, 1.4698319520484722]
+
+  """
+
+  @typedoc """
+  The **power** value in Box-Cox transformation.
+  """
+  @type l :: number()
+  @typedoc """
+  The **median** value in Box-Cox transformation.
+  """
+  @type m :: number()
+  @typedoc """
+  The **coefficient of variation** in Box-Cox transformation.
+  """
+  @type s :: number()
+
+  @spec compute(number(), l(), m(), s()) :: number()
+  @doc """
+  Compute the adjusted z-score for a given measurement (`y`) and the Box-Cox values: power (`l`), median (`m`), and
+  coefficient of variation (`s`).
+
+  ## Examples:
+
+      iex> Growth.Calc.ZScore.compute(30, -1.7862, 16.9392, 0.1107)
+      3.35390255606726
+      iex> Growth.Calc.ZScore.compute(14, -1.3592, 20.4951, 0.12579)
+      -3.7985108865993493
+      iex> Growth.Calc.ZScore.compute(19, -1.6318, 16.049, 0.10038)
+      1.4698319520484722
+
+  """
+  def compute(y, l, m, s) do
+    y
+    |> raw(l, m, s)
+    |> adjust(y, l, m, s)
+  end
+
+  @spec raw(number(), l(), m(), s()) :: number()
+  @doc """
+  Compute the raw z-score for a given measurement (`y`) and the Box-Cox values, power (`l`), median (`m`), and
+  coefficient of variation (`s`).
+
+  ## Examples
+
+      iex> Growth.Calc.ZScore.raw(30, -1.7862, 16.9392, 0.1107)
+      3.2353902101095855
+      iex> Growth.Calc.ZScore.raw(14, -1.3592, 20.4951, 0.12579)
+      -3.969714730727475
+      iex> Growth.Calc.ZScore.compute(19, -1.6318, 16.049, 0.10038)
+      1.4698319520484722
+
+  """
+  def raw(y, l, m, s) do
+    (:math.pow(y / m, l) - 1) / (s * l)
+  end
+
+  @spec adjust(number(), number(), l(), m(), s()) :: number()
+  @doc """
+  Adjust the raw z-score considering that extreme values, beyond -3 and 3 standard deviation, must be handled differently.
+  """
+  def adjust(zscore, y, l, m, s) when zscore > 3 do
+    [sd2, sd3, _, _] = cutoffs(l, m, s)
+    sd_delta = sd3 - sd2
+    3 + (y - sd3) / sd_delta
+  end
+
+  def adjust(zscore, y, l, m, s) when zscore < -3 do
+    [_, _, sd2, sd3] = cutoffs(l, m, s)
+    sd_delta = sd2 - sd3
+    -3 + (y - sd3) / sd_delta
+  end
+
+  def adjust(zscore, _, _, _, _) do
+    zscore
+  end
+
+  @spec cutoffs(number(), number(), number()) :: [number()]
+  @doc """
+  Calculate the standard deviations cutoffs (2, 3, -2, and -3) for a given set of fitted Box-Cox values: power (`l`),
+  median (`m`), and coefficient of variation (`s`).
+
+  These cutoffs are used to calculate the adjusted z-score.
+  """
+  def cutoffs(l, m, s) do
+    Enum.map([2, 3, -2, -3], &measure_at_standard_deviation(&1, l, m, s))
+  end
+
+  @spec measure_at_standard_deviation(integer(), number(), number(), number()) :: number()
+  @doc """
+  Calculate the measure value at a given standard deviation (`sd`), considering the fitted Box-Cox values: power (`l`),
+  median (`m`), and coefficient of variation (`s`).
+  """
+  def measure_at_standard_deviation(sd, l, m, s) do
+    m * :math.pow(1 + l * s * sd, 1 / l)
+  end
+end

lib/growth/growth.ex

@@ -0,0 +1,225 @@
+defmodule Growth do
+  @moduledoc """
+  Follow up child growth from 0 to 19 years, calculating z-scores for the following measurements:
+
+  * weight between ages 0 and 10 years
+  * height between ages 0 and 19 years
+  * body mass index (bmi) between ages 0 and 19 years
+  * head circumference between ages 0 and 5 years
+  * arm circumference between ages 3 months and 5 years
+  * subscapular skinfold between ages 3 months and 5 years
+  * triceps skinfold between ages 3 months and 5 years
+  """
+
+  alias __MODULE__.Calc.Age
+  alias __MODULE__.Calc.BMI
+  alias __MODULE__.Score
+
+  @type gender :: :male | :female
+
+  @type measure :: number() | nil
+
+  @type opts :: [
+          date_of_measurement: Date.t(),
+          weight: measure(),
+          height: measure(),
+          arm_circumference: measure(),
+          head_circumference: measure(),
+          subscapular_skinfold: measure(),
+          triceps_skinfold: measure()
+        ]
+
+  @type t :: %__MODULE__{
+          name: String.t(),
+          gender: gender(),
+          date_of_birth: Date.t(),
+          date_of_measurement: Date.t(),
+          age_in_days: pos_integer(),
+          age_in_weeks: pos_integer(),
+          age_in_months: pos_integer(),
+          weight: measure(),
+          height: measure(),
+          arm_circumference: measure(),
+          head_circumference: measure(),
+          subscapular_skinfold: measure(),
+          triceps_skinfold: measure(),
+          bmi: measure(),
+          results: list()
+        }
+
+  @enforce_keys [:name, :gender, :date_of_birth]
+  defstruct [
+    :name,
+    :gender,
+    :date_of_birth,
+    :date_of_measurement,
+    :age_in_days,
+    :age_in_weeks,
+    :age_in_months,
+    :weight,
+    :height,
+    :arm_circumference,
+    :head_circumference,
+    :subscapular_skinfold,
+    :triceps_skinfold,
+    :bmi,
+    :results
+  ]
+
+  @valid_measures [
+    :date_of_measurement,
+    :weight,
+    :height,
+    :arm_circumference,
+    :head_circumference,
+    :subscapular_skinfold,
+    :triceps_skinfold
+  ]
+
+  @doc """
+  Create a new growth measurement for a children with name, gender, date of birth, and the following optional arguments:
+
+  * `:date_of_measurement`: date when the measures were collected, defaults to today.
+  * `:weight`: weight in kilograms, defaults to `nil`.
+  * `:height`: height in centimeters, defaults to `nil`.
+  * `:arm_circumference`: arm circumference in centimeters, defaults to `nil`.
+  * `:head_circumference`: head circumference in centimeters, defaults to `nil`.
+  * `:subscapular_skinfold`: subscapular skinfold in milimeters, defaults to `nil`.
+  * `:triceps_skinfold`: triceps skinfold in milimeters, defaults to `nil`.
+
+  ## Examples
+
+      iex> Growth.new(
+      ...>   "child a",
+      ...>   :male,
+      ...>   ~D[2024-01-01],
+      ...>   date_of_measurement: ~D[2024-04-01],
+      ...>   weight: 8,
+      ...>   height: 65.4,
+      ...>   arm_circumference: 15.5,
+      ...>   head_circumference: 42.8,
+      ...>   subscapular_skinfold: 10.9,
+      ...>   triceps_skinfold: 13.5
+      ...> )
+      %Growth{
+        name: "child a",
+        gender: :male,
+        date_of_birth: ~D[2024-01-01],
+        date_of_measurement: ~D[2024-04-01],
+        age_in_days: 91,
+        age_in_weeks: 13,
+        age_in_months: 2,
+        weight: 8,
+        height: 65.4,
+        arm_circumference: 15.5,
+        head_circumference: 42.8,
+        subscapular_skinfold: 10.9,
+        triceps_skinfold: 13.5,
+        bmi: 18.703999850368,
+        results: [
+          head_circumference: [
+            day: {1.945484886994137, 0.9741416765426315},
+            week: {1.945484886994137, 0.9741416765426315},
+            month: {3.130859582465616, 0.9991285226182205}
+          ],
+          arm_circumference: [day: {1.9227031505630465, 0.9727413295221268}],
+          subscapular_skinfold: [day: {1.9437372448689536, 0.9740364275897885}],
+          triceps_skinfold: [day: {1.950277062993091, 0.974428447506235}],
+          weight: [
+            day: {1.982458622036091, 0.9762860329545557},
+            week: {1.982458622036091, 0.9762860329545557},
+            month: {3.0355951313091745, 0.9987996926038037}
+          ],
+          height: [
+            day: {1.956263992749136, 0.9747829682259178},
+            week: {1.956263992749136, 0.9747829682259178},
+            month: {3.4867331002754054, 0.9997555204670452}
+          ],
+          bmi: [
+            day: {1.1977344927294398, 0.8844898016950435},
+            week: {1.1977344927294398, 0.8844898016950435},
+            month: {1.5837461190318038, 0.9433742474306444}
+          ]
+        ]
+      }
+
+  """
+  @spec new(String.t(), gender(), Date.t(), opts()) :: t()
+  def new(name, gender, date_of_birth, opts \\ []) do
+    default_opts()
+    |> Enum.reduce(
+      %__MODULE__{
+        name: name,
+        gender: gender,
+        date_of_birth: date_of_birth,
+        results: []
+      },
+      fn {key, default_value}, measurement ->
+        opts
+        |> Keyword.get(key, default_value)
+        |> then(&Map.put(measurement, key, &1))
+      end
+    )
+    |> with_age_in_days()
+    |> with_age_in_weeks()
+    |> with_age_in_months()
+    |> with_bmi()
+    |> with_results()
+  end
+
+  for precision <- [:day, :week, :month] do
+    @doc """
+    Add age with given precision in growth measurement.
+    """
+    @spec unquote(:"with_age_in_#{precision}s")(t()) :: t()
+
+    def unquote(:"with_age_in_#{precision}s")(
+          %__MODULE__{date_of_birth: date_of_birth, date_of_measurement: date_of_measurement} =
+            growth
+        )
+        when not is_nil(date_of_birth) and not is_nil(date_of_measurement) do
+      age = Age.calculate(unquote(precision), date_of_birth, date_of_measurement)
+      Map.put(growth, unquote(:"age_in_#{precision}s"), age)
+    end
+
+    def unquote(:"with_age_in_#{precision}s")(%__MODULE__{date_of_birth: date_of_birth} = growth)
+        when not is_nil(date_of_birth) do
+      unquote(:"with_age_in_#{precision}s")(%{growth | date_of_measurement: Date.utc_today()})
+    end
+
+    def unquote(:"with_age_in_#{precision}s")(growth) do
+      growth
+    end
+  end
+
+  def with_bmi(%__MODULE__{weight: weight, height: height} = growth)
+      when is_number(weight) and is_number(height) do
+    %{growth | bmi: BMI.calculate(:metric, weight, height)}
+  end
+
+  def with_bmi(growth) do
+    growth
+  end
+
+  def with_results(growth) do
+    Score.Scorer.results(growth, [
+      Score.BMI,
+      Score.Height,
+      Score.Weight,
+      Score.TricepsSkinfold,
+      Score.SubscapularSkinfold,
+      Score.ArmCircumference,
+      Score.HeadCircumference
+    ])
+  end
+
+  defp default_opts do
+    Enum.map(@valid_measures, fn
+      :date_of_measurement = key ->
+        {key, Date.utc_today()}
+
+      key ->
+        {key, nil}
+    end)
+  end
+end

lib/growth/indicators/download.ex

@@ -0,0 +1,328 @@
+defmodule Growth.Indicators.Download do
+  @moduledoc """
+  To calculate z-scores for the different growth measurements, the system must:
+
+  1. Fetch indicators from World Health Organization
+  2. Extract data from excel sheets
+  3. Convert the data into proper format, specially, handle with decimal values
+  3. Add metadata to make search for the parameters possible
+
+  The following indicators to construct z-scores are fetched:
+
+  * [height for age 0 to 5 years](https://www.who.int/tools/child-growth-standards/standards/length-height-for-age)
+  * [height for age 5 to 19 years](https://www.who.int/tools/growth-reference-data-for-5to19-years/indicators/height-for-age)
+  * [weight for age 0 to 5 years](https://www.who.int/tools/child-growth-standards/standards/weight-for-age)
+  * [weight for age 5 to 10 years](https://www.who.int/tools/growth-reference-data-for-5to19-years/indicators/weight-for-age-5to10-years)
+  * [weight for height](https://www.who.int/tools/child-growth-standards/standards/weight-for-length-height)
+  * [body mass index (bmi) for age 0 to 5 years](https://www.who.int/toolkits/child-growth-standards/standards/body-mass-index-for-age-bmi-for-age)
+  * [body mass index (bmi) for age 5 to 19 years](https://www.who.int/tools/growth-reference-data-for-5to19-years/indicators/bmi-for-age)
+  * [head circumference for age 0 to 5 years](https://www.who.int/tools/child-growth-standards/standards/head-circumference-for-age)
+  * [arm circumference for age 3 months to 5 years](https://www.who.int/tools/child-growth-standards/standards/arm-circumference-for-age)
+  * [subscapular skinfold for age 3 months to 5 years](https://www.who.int/tools/child-growth-standards/standards/subscapular-skinfold-for-age)
+  * [triceps skinfold for age 3 months to 5 years](https://www.who.int/tools/child-growth-standards/standards/triceps-skinfold-for-age)
+  """
+
+  NimbleCSV.define(IndicatorParser, separator: ",", escape: "\"")
+
+  @urls %{
+    height_for_age: %{
+      female: %{
+        age_tables: ~w[
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/lhfa_girls_0-to-13-weeks_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/lhfa_girls_0-to-2-years_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/lhfa_girls_2-to-5-years_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/growth-reference-5-19-years/height-for-age-(5-19-years)/hfa-girls-z-who-2007-exp.xlsx
+        ],
+        expanded_tables: ~w[
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/expandable-tables/lhfa-girls-zscore-expanded-tables.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/growth-reference-5-19-years/height-for-age-(5-19-years)/hfa-girls-z-who-2007-exp.xlsx
+        ]
+      },
+      male: %{
+        age_tables: ~w[
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/lhfa_boys_0-to-13-weeks_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/lhfa_boys_0-to-2-years_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/lhfa_boys_2-to-5-years_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/growth-reference-5-19-years/height-for-age-(5-19-years)/hfa-boys-z-who-2007-exp.xlsx
+        ],
+        expanded_tables: ~w[
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/expandable-tables/lhfa-boys-zscore-expanded-tables.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/growth-reference-5-19-years/height-for-age-(5-19-years)/hfa-boys-z-who-2007-exp.xlsx
+        ]
+      }
+    },
+    weight_for_age: %{
+      female: %{
+        age_tables: ~w[
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/weight-for-age/wfa_girls_0-to-13-weeks_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/weight-for-age/wfa_girls_0-to-5-years_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/growth-reference-5-19-years/weight-for-age-(5-10-years)/hfa-girls-z-who-2007-exp_7ea58763-36a2-436d-bef0-7fcfbadd2820.xlsx
+        ],
+        expanded_tables: ~w[
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/weight-for-age/expanded-tables/wfa-girls-zscore-expanded-tables.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/growth-reference-5-19-years/weight-for-age-(5-10-years)/hfa-girls-z-who-2007-exp_7ea58763-36a2-436d-bef0-7fcfbadd2820.xlsx
+        ]
+      },
+      male: %{
+        age_tables: ~w[
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/weight-for-age/wfa_boys_0-to-13-weeks_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/weight-for-age/wfa_boys_0-to-5-years_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/growth-reference-5-19-years/weight-for-age-(5-10-years)/hfa-boys-z-who-2007-exp_0ff9c43c-8cc0-4c23-9fc6-81290675e08b.xlsx
+        ],
+        expanded_tables: ~w[
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/weight-for-age/expanded-tables/wfa-boys-zscore-expanded-tables.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/growth-reference-5-19-years/weight-for-age-(5-10-years)/hfa-boys-z-who-2007-exp_0ff9c43c-8cc0-4c23-9fc6-81290675e08b.xlsx
+        ]
+      }
+    },
+    weight_for_height: %{
+      female: %{
+        age_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/weight-for-length-height/wfl_girls_0-to-2-years_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/weight-for-length-height/wfh_girls_2-to-5-years_zscores.xlsx
+        ),
+        expanded_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/weight-for-length-height/expanded-tables/wfl-girls-zscore-expanded-table.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/weight-for-length-height/expanded-tables/wfh-girls-zscore-expanded-tables.xlsx
+        )
+      },
+      male: %{
+        age_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/weight-for-length-height/wfl_boys_0-to-2-years_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/weight-for-length-height/wfh_boys_2-to-5-years_zscores.xlsx
+        ),
+        expanded_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/weight-for-length-height/expanded-tables/wfl-boys-zscore-expanded-table.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/weight-for-length-height/expanded-tables/wfh-boys-zscore-expanded-tables.xlsx
+        )
+      }
+    },
+    bmi_for_age: %{
+      female: %{
+        age_tables: ~w[
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/body-mass-index-for-age/bmi_girls_0-to-13-weeks_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/body-mass-index-for-age/bmi_girls_0-to-2-years_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/body-mass-index-for-age/bmi_girls_2-to-5-years_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/growth-reference-5-19-years/bmi-for-age-(5-19-years)/bmi-girls-z-who-2007-exp.xlsx
+        ],
+        expanded_tables: ~w[
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/body-mass-index-for-age/expanded-tables/bfa-girls-zscore-expanded-tables.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/growth-reference-5-19-years/bmi-for-age-(5-19-years)/bmi-girls-z-who-2007-exp.xlsx
+        ]
+      },
+      male: %{
+        age_tables: ~w[
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/body-mass-index-for-age/bmi_boys_0-to-13-weeks_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/body-mass-index-for-age/bmi_boys_0-to-2-years_zcores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/body-mass-index-for-age/bmi_boys_2-to-5-years_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/growth-reference-5-19-years/bmi-for-age-(5-19-years)/bmi-boys-z-who-2007-exp.xlsx
+        ],
+        expanded_tables: ~w[
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/body-mass-index-for-age/expanded-tables/bfa-boys-zscore-expanded-tables.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/growth-reference-5-19-years/bmi-for-age-(5-19-years)/bmi-boys-z-who-2007-exp.xlsx
+        ]
+      }
+    },
+    head_circumference_for_age: %{
+      female: %{
+        age_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/head-circumference-for-age/hcfa-girls-0-13-zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/head-circumference-for-age/hcfa-girls-0-5-zscores.xlsx
+        ),
+        expanded_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/head-circumference-for-age/expanded-tables/hcfa-girls-zscore-expanded-tables.xlsx
+        )
+      },
+      male: %{
+        age_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/head-circumference-for-age/hcfa-boys-0-13-zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/head-circumference-for-age/hcfa-boys-0-5-zscores.xlsx
+        ),
+        expanded_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/head-circumference-for-age/expanded-tables/hcfa-boys-zscore-expanded-tables.xlsx
+        )
+      }
+    },
+    arm_circumference_for_age: %{
+      female: %{
+        age_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/arm-circumference-for-age/acfa-girls-3-5-zscores.xlsx
+        ),
+        expanded_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/arm-circumference-for-age/expanded-tables/acfa-girls-zscore-expanded-tables.xlsx
+        )
+      },
+      male: %{
+        age_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/arm-circumference-for-age/acfa-boys-3-5-zscores.xlsx
+        ),
+        expanded_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/arm-circumference-for-age/expanded-tables/acfa-boys-zscore-expanded-tables.xlsx
+        )
+      }
+    },
+    subscapular_skinfold_for_age: %{
+      female: %{
+        age_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/subscapular-skinfold-for-age/ssfa-girls-3-5-zscores.xlsx
+        ),
+        expanded_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/subscapular-skinfold-for-age/expanded-tables/ssfa-girls-zscore-expanded-table.xlsx
+        )
+      },
+      male: %{
+        age_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/subscapular-skinfold-for-age/ssfa-boys-3-5-zscores.xlsx
+        ),
+        expanded_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/subscapular-skinfold-for-age/expanded-tables/ssfa-boys-zscore-expanded-table.xlsx
+        )
+      }
+    },
+    triceps_skinfold_for_age: %{
+      female: %{
+        age_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/triceps-skinfold-for-age/tsfa-girls-3-5-zscores.xlsx
+        ),
+        expanded_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/triceps-skinfold-for-age/expanded-tables/tsfa-girls-zscore-expanded-tables.xlsx
+        )
+      },
+      male: %{
+        age_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/triceps-skinfold-for-age/tsfa-boys-3-5-zscores.xlsx
+        ),
+        expanded_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/triceps-skinfold-for-age/expanded-tables/tsfa-boys-zscore-expanded-tables.xlsx
+        )
+      }
+    }
+  }
+
+  def process_all do
+    @urls
+    |> Enum.map(&Task.async(__MODULE__, :process_measure, [&1]))
+    |> Task.await_many()
+  end
+
+  def process_measure({measure, urls}) do
+    urls
+    |> process_genders()
+    |> as_csv()
+    |> save(measure)
+  end
+
+  def process_genders(%{
+        female: %{age_tables: female_urls, expanded_tables: e_female_urls},
+        male: %{age_tables: male_urls, expanded_tables: e_male_urls}
+      }) do
+    [
+      {:female, :age, female_urls},
+      {:male, :age, male_urls},
+      {:female, :expanded, e_female_urls},
+      {:male, :expanded, e_male_urls}
+    ]
+    |> Enum.map(&Task.async(__MODULE__, :process_gender, [&1]))
+    |> Task.await_many()
+    |> merge()
+  end
+
+  def process_gender({gender, category, urls}) do
+    urls
+    |> Enum.map(&Task.async(__MODULE__, :process, [gender, category, &1]))
+    |> Task.await_many()
+    |> merge()
+  end
+
+  def process(gender, category, url) do
+    url
+    |> fetch!()
+    |> extract!(url)
+    |> convert(gender, category, url)
+  end
+
+  def fetch!(url) do
+    req =
+      [url: url]
+      |> Keyword.merge(
+        :wabanex
+        |> Application.get_env(__MODULE__, [])
+        |> Keyword.get(:who_req_options, [])
+      )
+      |> Req.new()
+
+    case Req.get(req) do
+      {:ok, %{status: 200, body: body}} ->
+        body
+
+      _ ->
+        raise("fetch failed for url #{url}")
+    end
+  end
+
+  def extract!(content, url) do
+    with {:ok, package} <- XlsxReader.open(content, source: :binary),
+         [sheet_name | _] <- XlsxReader.sheet_names(package),
+         {:ok, data} <- XlsxReader.sheet(package, sheet_name) do
+      data
+    else
+      _ -> raise("failed to extract excel for #{url}")
+    end
+  end
+
+  @common_header ~w(source category gender age_unit age l m s sd3neg sd2neg sd1neg sd0 sd1 sd2 sd3)
+
+  # FIX: (jpd) weight for lenght/height does not have an age in the header row
+  def convert([header | rows], gender, category, url) do
+    age_unit = header |> hd() |> String.downcase()
+
+    fixed_header = header |> tl() |> Enum.map(&String.downcase/1) |> Enum.map(&String.trim/1)
+
+    parsed_header = ["source" | ["category" | ["gender" | ["age_unit" | ["age" | fixed_header]]]]]
+
+    # NOTE: (jpd): parsing the rows consist in:
+    # 1. convert row values to decimal
+    # 2. prepend the values url source, gender, and age unit
+    # 3. convert row to keyword list using the parsed header
+    # 4. convert from keyword list to map
+    # 5. fetch common values based on common headers
+    # 6. sort row values based on common headers
+    parsed_rows =
+      rows
+      |> Stream.map(fn row -> Enum.map(row, &Decimal.new/1) end)
+      |> Stream.map(&[url | [category | [gender | [age_unit | &1]]]])
+      |> Stream.map(&Enum.zip(parsed_header, &1))
+      |> Stream.map(&Map.new/1)
+      |> Stream.map(&Map.take(&1, @common_header))
+      |> Enum.map(fn row ->
+        Enum.map(@common_header, fn key -> Map.get(row, key) end)
+      end)
+
+    [@common_header | parsed_rows]
+  end
+
+  def merge(datum) do
+    datum
+    |> Stream.with_index()
+    |> Stream.map(fn
+      {data, 0} ->
+        data
+
+      {[_ | data], _} ->
+        data
+    end)
+    |> Enum.reduce([], fn data, accum ->
+      Enum.concat(accum, data)
+    end)
+  end
+
+  def as_csv(data) do
+    IndicatorParser.dump_to_iodata(data)
+  end
+
+  def save(data, measurement) do
+    :wabanex
+    |> Application.app_dir(["priv", "growth", "indicators", "#{measurement}.csv"])
+    |> File.write(data)
+  end
+end

lib/growth/indicators/load.ex

@@ -0,0 +1,190 @@
+defmodule Growth.Indicators.Load do
+  @moduledoc """
+  Load local indicators csv files into ets.
+
+  For each measurement an ets table is created, so the system has the following tables:
+
+  * `Growth.Score.ArmCircumference`
+  * `Growth.Score.BMI`
+  * `Growth.Score.HeadCircumference`
+  * `Growth.Score.Height`
+  * `Growth.Score.SubscapularSkinfold`
+  * `Growth.Score.TricepsSkinfold`
+  * `Growth.Score.Weight`
+  * `Growth.Score.WeightForHeight`
+
+  The rows in the csv files are converted to two tuple, representing the a key and value, with the following format:
+
+  * **key**: `{gender, unit, t-value}`
+  * **value**: map with the keys:
+    * l
+    * m
+    * s
+    * sd3neg
+    * sd2neg
+    * sd1neg
+    * sd0
+    * sd1
+    * sd2
+    * sd3
+    * source
+    * category
+
+  """
+
+  use Task
+
+  require Logger
+
+  alias Growth.Score
+
+  @measure_to_score [
+    arm_circumference_for_age: Score.ArmCircumference,
+    bmi_for_age: Score.BMI,
+    head_circumference_for_age: Score.HeadCircumference,
+    height_for_age: Score.Height,
+    subscapular_skinfold_for_age: Score.SubscapularSkinfold,
+    triceps_skinfold_for_age: Score.TricepsSkinfold,
+    weight_for_age: Score.Weight,
+    weight_for_height: Score.WeightForHeight
+  ]
+
+  @doc false
+  def start_link(_) do
+    _ =
+      Enum.map(@measure_to_score, fn {_, measure} ->
+        create_ets(measure)
+      end)
+
+    Task.start_link(__MODULE__, :all, [])
+  end
+
+  @spec all :: [[boolean()]]
+  @doc """
+  Load indicators csv files into their own ets tables.
+  """
+  def all do
+    Logger.debug("load growth indicators")
+
+    :wabanex
+    |> Application.app_dir(["priv", "growth", "indicators", "*.csv"])
+    |> Path.wildcard()
+    |> Enum.map(&create_ets_from_filename/1)
+    |> Enum.map(&Task.async(__MODULE__, :load_measure, [&1]))
+    |> Task.await_many()
+  end
+
+  @spec create_ets(module()) :: module()
+  @doc """
+  Create a public ets table for the growth module, using it as the table name.
+
+  Returns the given module.
+  """
+  def create_ets(measure) do
+    try do
+      :ets.new(measure, [:set, :public, :named_table])
+    rescue
+      _ ->
+        nil
+    end
+
+    measure
+  end
+
+  @spec create_ets_from_filename(String.t()) :: {atom(), String.t()}
+  @doc """
+  Create ets table based on filename and return a tuple with the ets table name and filename.
+  """
+  def create_ets_from_filename(filename) do
+    measure =
+      filename
+      |> Path.basename()
+      |> Path.rootname()
+      |> String.to_atom()
+      |> then(&Keyword.get(@measure_to_score, &1, &1))
+      |> create_ets()
+
+    {measure, filename}
+  end
+
+  @spec load_measure({atom(), String.t()}) :: [boolean()]
+  @doc """
+  Read, convert, and load a measure/filename into the proper ets table.
+  """
+  def load_measure({measure, filename}) do
+    Logger.debug("load data from #{filename} into #{measure}")
+
+    filename
+    |> read()
+    |> convert()
+    |> load(measure)
+  end
+
+  @spec read(String.t()) :: Enumerable.t()
+  @doc false
+  def read(filename) do
+    filename
+    |> File.stream!()
+    |> IndicatorParser.parse_stream()
+  end
+
+  @spec convert(Enumerable.t()) :: Enumerable.t()
+  @doc false
+  def convert(data) do
+    Stream.map(data, fn [
+                          source,
+                          category,
+                          gender,
+                          unit,
+                          t,
+                          l,
+                          m,
+                          s,
+                          sd3neg,
+                          sd2neg,
+                          sd1neg,
+                          sd0,
+                          sd1,
+                          sd2,
+                          sd3
+                        ] ->
+      converted_t =
+        if unit in ~w(day week month) do
+          as_integer(t)
+        else
+          as_float(t)
+        end
+
+      key = {String.to_atom(gender), String.to_atom(unit), converted_t}
+
+      value = %{
+        l: as_float(l),
+        m: as_float(m),
+        s: as_float(s),
+        sd3neg: as_float(sd3neg),
+        sd2neg: as_float(sd2neg),
+        sd1neg: as_float(sd1neg),
+        sd0: as_float(sd0),
+        sd1: as_float(sd1),
+        sd2: as_float(sd2),
+        sd3: as_float(sd3),
+        source: source,
+        category: category
+      }
+
+      {key, value}
+    end)
+  end
+
+  @spec load(Enumerable.t(), atom()) :: [boolean()]
+  @doc false
+  def load(data, ets_table) do
+    Enum.map(data, fn {key, value} ->
+      :ets.insert_new(ets_table, {key, value})
+    end)
+  end
+
+  defp as_integer(value), do: value |> Integer.parse() |> elem(0)
+
+  defp as_float(value), do: value |> Float.parse() |> elem(0)
+end

lib/growth/score/arm_circumference.ex

@@ -0,0 +1,18 @@
+defmodule Growth.Score.ArmCircumference do
+  @moduledoc """
+  Calculate z-score for arm circumference for age.
+  """
+
+  @behaviour Growth.Score.Scorer
+
+  alias Growth.Score.Scorer
+
+  @impl Scorer
+  @spec measure_name() :: atom()
+  @doc """
+  Name of the measurement used in arm circumference indicator.
+  """
+  def measure_name do
+    :arm_circumference
+  end
+end

lib/growth/score/bmi.ex

@@ -0,0 +1,18 @@
+defmodule Growth.Score.BMI do
+  @moduledoc """
+  Calculate z-score for body mass index for age.
+  """
+
+  @behaviour Growth.Score.Scorer
+
+  alias Growth.Score.Scorer
+
+  @impl Scorer
+  @spec measure_name() :: atom()
+  @doc """
+  Name of the measurement used in BMI indicator.
+  """
+  def measure_name do
+    :bmi
+  end
+end

lib/growth/score/head_circumference.ex

@@ -0,0 +1,18 @@
+defmodule Growth.Score.HeadCircumference do
+  @moduledoc """
+  Calculate z-score for head circumference for age.
+  """
+
+  @behaviour Growth.Score.Scorer
+
+  alias Growth.Score.Scorer
+
+  @impl Scorer
+  @spec measure_name() :: atom()
+  @doc """
+  Name of the measurement used in head circumference indicator.
+  """
+  def measure_name do
+    :head_circumference
+  end
+end

lib/growth/score/height.ex

@@ -0,0 +1,18 @@
+defmodule Growth.Score.Height do
+  @moduledoc """
+  Calculate z-score for height for age.
+  """
+
+  @behaviour Growth.Score.Scorer
+
+  alias Growth.Score.Scorer
+
+  @impl Scorer
+  @spec measure_name() :: atom()
+  @doc """
+  Name of the measurement used in height indicator.
+  """
+  def measure_name do
+    :height
+  end
+end

lib/growth/score/scorer.ex

@@ -0,0 +1,96 @@
+defmodule Growth.Score.Scorer do
+  @moduledoc """
+  Behaviour defining common interface to calculate z-score and percentile for a given measurement.
+  """
+
+  alias Growth.Calc.Percentile
+  alias Growth.Calc.ZScore
+
+  @callback measure_name() :: atom()
+
+  @spec results(Growth.t(), [module()]) :: Growth.t()
+  @doc """
+  Add z-score and centile values in growth measurements `results` for each indicator.
+  """
+  def results(growth, indicators) do
+    Enum.reduce(indicators, growth, &result/2)
+  end
+
+  @spec result(module(), Growth.t()) :: Growth.t()
+  @doc """
+  Calculate z-score and percentile values for the given indicator and add them to the growth measurement `results`.
+  """
+  def result(indicator, growth) do
+    result =
+      growth
+      |> lms(indicator)
+      |> Enum.map(fn {precision, {l, m, s}} ->
+        {precision, scores(indicator, growth, l, m, s)}
+      end)
+
+    %{growth | results: Keyword.put(growth.results, indicator.measure_name(), result)}
+  end
+
+  @spec lms(Growth.t(), module()) :: [{String.t(), {number(), number(), number()}}]
+  @doc """
+  Get the indicaator fitted values of Box-Cox transformation:
+
+  * power (`l`)
+  * median (`m`)
+  * coefficient of variation (`s`)
+
+  """
+  def lms(growth, indicator) do
+    [
+      {growth.gender, :day, growth.age_in_days},
+      {growth.gender, :week, growth.age_in_weeks},
+      {growth.gender, :month, growth.age_in_months}
+    ]
+    |> Enum.map(fn {_, precision, _} = key ->
+      case :ets.lookup(indicator, key) do
+        [{^key, %{l: l, m: m, s: s}} | _] ->
+          {precision, {l, m, s}}
+
+        _ ->
+          nil
+      end
+    end)
+    |> Enum.reject(&is_nil/1)
+  end
+
+  @doc """
+  Calculate the z-score and percentile of an indicator measurement.
+  """
+  @spec scores(module(), Growth.t(), ZScore.l(), ZScore.m(), ZScore.s()) ::
+          {Growth.measure(), Growth.measure()}
+  def scores(indicator, growth, l, m, s) do
+    growth
+    |> Map.get(indicator.measure_name())
+    |> z_score(l, m, s)
+    |> then(fn score -> {score, percentile(score)} end)
+  end
+
+  @doc """
+  Check `Growth.Calc.ZScore.compute/4`.
+  """
+  @spec z_score(Growth.measure(), ZScore.l(), ZScore.m(), ZScore.s()) :: Growth.measure()
+  def z_score(nil, _, _, _) do
+    nil
+  end
+
+  def z_score(value, l, m, s) do
+    ZScore.compute(value, l, m, s)
+  end
+
+  @doc """
+  Check `Growth.Calc.Percentile.compute/1`.
+  """
+  @spec percentile(Growth.measure()) :: Growth.measure()
+  def percentile(nil) do
+    nil
+  end
+
+  def percentile(score) do
+    Percentile.compute(score)
+  end
+end

lib/growth/score/subscapular_skinfold.ex

@@ -0,0 +1,18 @@
+defmodule Growth.Score.SubscapularSkinfold do
+  @moduledoc """
+  Calculate z-score for subscapular skinfold for age.
+  """
+
+  @behaviour Growth.Score.Scorer
+
+  alias Growth.Score.Scorer
+
+  @impl Scorer
+  @spec measure_name() :: atom()
+  @doc """
+  Name of the measurement used in subscapular skinfold indicator.
+  """
+  def measure_name do
+    :subscapular_skinfold
+  end
+end

lib/growth/score/triceps_skinfold.ex

@@ -0,0 +1,18 @@
+defmodule Growth.Score.TricepsSkinfold do
+  @moduledoc """
+  Calculate z-score for triceps skinfold for age.
+  """
+
+  @behaviour Growth.Score.Scorer
+
+  alias Growth.Score.Scorer
+
+  @impl Scorer
+  @spec measure_name() :: atom()
+  @doc """
+  Name of the measurement used in triceps skinfold indicator.
+  """
+  def measure_name do
+    :triceps_skinfold
+  end
+end

lib/growth/score/weight.ex

@@ -0,0 +1,18 @@
+defmodule Growth.Score.Weight do
+  @moduledoc """
+  Calculate z-score for weight for age.
+  """
+
+  @behaviour Growth.Score.Scorer
+
+  alias Growth.Score.Scorer
+
+  @impl Scorer
+  @spec measure_name() :: atom()
+  @doc """
+  Name of the measurement used in weight indicator.
+  """
+  def measure_name do
+    :weight
+  end
+end

lib/growth/score/weight_for_height.ex

@@ -0,0 +1,5 @@
+defmodule Growth.Score.WeightForHeight do
+  @moduledoc """
+  Calculate z-score for weight for height.
+  """
+end

lib/wabanex/application.ex

@@ -9,6 +9,7 @@ defmodule Wabanex.Application do
       Wabanex.Repo,
       WabanexWeb.Telemetry,
       {Phoenix.PubSub, name: Wabanex.PubSub},
+      {Growth.Indicators.Load, []},
       {DNSCluster,
        query: Application.get_env(:wabanex, :dns_cluster_query) || :ignore,
        log: :info,

mix.exs

@@ -35,25 +35,31 @@ defmodule Wabanex.MixProject do
        ref: "5de21da279938d1a10642f94d5e9c9fbdc846149"},
       {:credo, "~> 1.7.0", only: [:dev, :test], runtime: false},
       {:crudry, "~> 2.4.0"},
+      {:decimal, "~> 2.3.0"},
       {:dialyxir, "~> 1.4.0", only: [:dev, :test], runtime: false},
       {:dns_cluster, "~> 0.2.0"},
       {:ecto_sql, "~> 3.12.0"},
+      {:elixlsx, "~> 0.6.0", only: :test},
+      {:ex_doc, "~> 0.37.0", only: :dev, runtime: false},
       {:gettext, "~> 0.26.0"},
       {:jason, "~> 1.4.0"},
       {:junit_formatter, "~> 3.4.0", only: [:test]},
       {:lcov_ex, "~> 0.3.0", only: [:dev, :test], runtime: false},
       {:mix_audit, "~> 2.1.0", only: [:dev, :test], runtime: false},
+      {:nimble_csv, "~> 1.2.0"},
       {:pg_ranges, "~> 1.1.0"},
       {:phoenix, "~> 1.7.0"},
       {:phoenix_ecto, "~> 4.6.0"},
-      {:phoenix_view, "~> 2.0.0"},
       {:phoenix_live_dashboard, "~> 0.8.0"},
+      {:phoenix_view, "~> 2.0.0"},
       {:plug_cowboy, "~> 2.7.0"},
       {:postgrex, "~> 0.20.0"},
       {:prom_ex, "~> 1.11.0"},
+      {:req, "~> 0.5.0"},
       {:sobelow, "~> 0.13", only: [:dev, :test], runtime: false},
       {:telemetry_metrics, "~> 1.1.0"},
-      {:telemetry_poller, "~> 1.1.0"}
+      {:telemetry_poller, "~> 1.1.0"},
+      {:xlsx_reader, "~> 0.8.0"}
     ]
   end
 

mix.lock

@@ -12,9 +12,12 @@
   "decimal": {:hex, :decimal, "2.3.0", "3ad6255aa77b4a3c4f818171b12d237500e63525c2fd056699967a3e7ea20f62", [:mix], [], "hexpm", "a4d66355cb29cb47c3cf30e71329e58361cfcb37c34235ef3bf1d7bf3773aeac"},
   "dialyxir": {:hex, :dialyxir, "1.4.5", "ca1571ac18e0f88d4ab245f0b60fa31ff1b12cbae2b11bd25d207f865e8ae78a", [:mix], [{:erlex, ">= 0.2.7", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "b0fb08bb8107c750db5c0b324fa2df5ceaa0f9307690ee3c1f6ba5b9eb5d35c3"},
   "dns_cluster": {:hex, :dns_cluster, "0.2.0", "aa8eb46e3bd0326bd67b84790c561733b25c5ba2fe3c7e36f28e88f384ebcb33", [:mix], [], "hexpm", "ba6f1893411c69c01b9e8e8f772062535a4cf70f3f35bcc964a324078d8c8240"},
+  "earmark_parser": {:hex, :earmark_parser, "1.4.44", "f20830dd6b5c77afe2b063777ddbbff09f9759396500cdbe7523efd58d7a339c", [:mix], [], "hexpm", "4778ac752b4701a5599215f7030989c989ffdc4f6df457c5f36938cc2d2a2750"},
   "ecto": {:hex, :ecto, "3.12.5", "4a312960ce612e17337e7cefcf9be45b95a3be6b36b6f94dfb3d8c361d631866", [:mix], [{:decimal, "~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "6eb18e80bef8bb57e17f5a7f068a1719fbda384d40fc37acb8eb8aeca493b6ea"},
   "ecto_sql": {:hex, :ecto_sql, "3.12.1", "c0d0d60e85d9ff4631f12bafa454bc392ce8b9ec83531a412c12a0d415a3a4d0", [:mix], [{:db_connection, "~> 2.4.1 or ~> 2.5", [hex: :db_connection, repo: "hexpm", optional: false]}, {:ecto, "~> 3.12", [hex: :ecto, repo: "hexpm", optional: false]}, {:myxql, "~> 0.7", [hex: :myxql, repo: "hexpm", optional: true]}, {:postgrex, "~> 0.19 or ~> 1.0", [hex: :postgrex, repo: "hexpm", optional: true]}, {:tds, "~> 2.1.1 or ~> 2.2", [hex: :tds, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4.0 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "aff5b958a899762c5f09028c847569f7dfb9cc9d63bdb8133bff8a5546de6bf5"},
+  "elixlsx": {:hex, :elixlsx, "0.6.0", "858c2c821ab52f4ca0988adce188d19f3b239a4fff8b36b26cd81ec8af9b2ab3", [:mix], [], "hexpm", "c4766f47afea075a85950a5c6fe981e98b8b8a30cc076382aaacf2bb8dbcd25d"},
   "erlex": {:hex, :erlex, "0.2.7", "810e8725f96ab74d17aac676e748627a07bc87eb950d2b83acd29dc047a30595", [:mix], [], "hexpm", "3ed95f79d1a844c3f6bf0cea61e0d5612a42ce56da9c03f01df538685365efb0"},
+  "ex_doc": {:hex, :ex_doc, "0.37.3", "f7816881a443cd77872b7d6118e8a55f547f49903aef8747dbcb345a75b462f9", [:mix], [{:earmark_parser, "~> 1.4.42", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_c, ">= 0.1.0", [hex: :makeup_c, repo: "hexpm", optional: true]}, {:makeup_elixir, "~> 0.14 or ~> 1.0", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1 or ~> 1.0", [hex: :makeup_erlang, repo: "hexpm", optional: false]}, {:makeup_html, ">= 0.1.0", [hex: :makeup_html, repo: "hexpm", optional: true]}], "hexpm", "e6aebca7156e7c29b5da4daa17f6361205b2ae5f26e5c7d8ca0d3f7e18972233"},
   "expo": {:hex, :expo, "1.1.0", "f7b9ed7fb5745ebe1eeedf3d6f29226c5dd52897ac67c0f8af62a07e661e5c75", [:mix], [], "hexpm", "fbadf93f4700fb44c331362177bdca9eeb8097e8b0ef525c9cc501cb9917c960"},
   "file_system": {:hex, :file_system, "1.1.0", "08d232062284546c6c34426997dd7ef6ec9f8bbd090eb91780283c9016840e8f", [:mix], [], "hexpm", "bfcf81244f416871f2a2e15c1b515287faa5db9c6bcf290222206d120b3d43f6"},
   "finch": {:hex, :finch, "0.19.0", "c644641491ea854fc5c1bbaef36bfc764e3f08e7185e1f084e35e0672241b76d", [:mix], [{:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:mint, "~> 1.6.2 or ~> 1.7", [hex: :mint, repo: "hexpm", optional: false]}, {:nimble_options, "~> 0.4 or ~> 1.0", [hex: :nimble_options, repo: "hexpm", optional: false]}, {:nimble_pool, "~> 1.1", [hex: :nimble_pool, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "fc5324ce209125d1e2fa0fcd2634601c52a787aff1cd33ee833664a5af4ea2b6"},
@@ -23,9 +26,13 @@
   "jason": {:hex, :jason, "1.4.4", "b9226785a9aa77b6857ca22832cffa5d5011a667207eb2a0ad56adb5db443b8a", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "c5eb0cab91f094599f94d55bc63409236a8ec69a21a67814529e8d5f6cc90b3b"},
   "junit_formatter": {:hex, :junit_formatter, "3.4.0", "d0e8db6c34dab6d3c4154c3b46b21540db1109ae709d6cf99ba7e7a2ce4b1ac2", [:mix], [], "hexpm", "bb36e2ae83f1ced6ab931c4ce51dd3dbef1ef61bb4932412e173b0cfa259dacd"},
   "lcov_ex": {:hex, :lcov_ex, "0.3.4", "f48aed787db0d1cff1409db391f442cdbc0af0f860dbc326430030027e6ded36", [:mix], [], "hexpm", "c3987b6aeadd78d4b7933fa9cc4de3bd69d34f0fae39bad908f79a7ceea957e5"},
+  "makeup": {:hex, :makeup, "1.2.1", "e90ac1c65589ef354378def3ba19d401e739ee7ee06fb47f94c687016e3713d1", [:mix], [{:nimble_parsec, "~> 1.4", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "d36484867b0bae0fea568d10131197a4c2e47056a6fbe84922bf6ba71c8d17ce"},
+  "makeup_elixir": {:hex, :makeup_elixir, "1.0.1", "e928a4f984e795e41e3abd27bfc09f51db16ab8ba1aebdba2b3a575437efafc2", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "7284900d412a3e5cfd97fdaed4f5ed389b8f2b4cb49efc0eb3bd10e2febf9507"},
+  "makeup_erlang": {:hex, :makeup_erlang, "1.0.2", "03e1804074b3aa64d5fad7aa64601ed0fb395337b982d9bcf04029d68d51b6a7", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "af33ff7ef368d5893e4a267933e7744e46ce3cf1f61e2dccf53a111ed3aa3727"},
   "mime": {:hex, :mime, "2.0.6", "8f18486773d9b15f95f4f4f1e39b710045fa1de891fada4516559967276e4dc2", [:mix], [], "hexpm", "c9945363a6b26d747389aac3643f8e0e09d30499a138ad64fe8fd1d13d9b153e"},
   "mint": {:hex, :mint, "1.7.1", "113fdb2b2f3b59e47c7955971854641c61f378549d73e829e1768de90fc1abf1", [:mix], [{:castore, "~> 0.1.0 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:hpax, "~> 0.1.1 or ~> 0.2.0 or ~> 1.0", [hex: :hpax, repo: "hexpm", optional: false]}], "hexpm", "fceba0a4d0f24301ddee3024ae116df1c3f4bb7a563a731f45fdfeb9d39a231b"},
   "mix_audit": {:hex, :mix_audit, "2.1.4", "0a23d5b07350cdd69001c13882a4f5fb9f90fbd4cbf2ebc190a2ee0d187ea3e9", [:make, :mix], [{:jason, "~> 1.4", [hex: :jason, repo: "hexpm", optional: false]}, {:yaml_elixir, "~> 2.11", [hex: :yaml_elixir, repo: "hexpm", optional: false]}], "hexpm", "fd807653cc8c1cada2911129c7eb9e985e3cc76ebf26f4dd628bb25bbcaa7099"},
+  "nimble_csv": {:hex, :nimble_csv, "1.2.0", "4e26385d260c61eba9d4412c71cea34421f296d5353f914afe3f2e71cce97722", [:mix], [], "hexpm", "d0628117fcc2148178b034044c55359b26966c6eaa8e2ce15777be3bbc91b12a"},
   "nimble_options": {:hex, :nimble_options, "1.1.1", "e3a492d54d85fc3fd7c5baf411d9d2852922f66e69476317787a7b2bb000a61b", [:mix], [], "hexpm", "821b2470ca9442c4b6984882fe9bb0389371b8ddec4d45a9504f00a66f650b44"},
   "nimble_parsec": {:hex, :nimble_parsec, "1.4.2", "8efba0122db06df95bfaa78f791344a89352ba04baedd3849593bfce4d0dc1c6", [:mix], [], "hexpm", "4b21398942dda052b403bbe1da991ccd03a053668d147d53fb8c4e0efe09c973"},
   "nimble_pool": {:hex, :nimble_pool, "1.1.0", "bf9c29fbdcba3564a8b800d1eeb5a3c58f36e1e11d7b7fb2e084a643f645f06b", [:mix], [], "hexpm", "af2e4e6b34197db81f7aad230c1118eac993acc0dae6bc83bac0126d4ae0813a"},
@@ -40,12 +47,14 @@
   "phoenix_pubsub": {:hex, :phoenix_pubsub, "2.1.3", "3168d78ba41835aecad272d5e8cd51aa87a7ac9eb836eabc42f6e57538e3731d", [:mix], [], "hexpm", "bba06bc1dcfd8cb086759f0edc94a8ba2bc8896d5331a1e2c2902bf8e36ee502"},
   "phoenix_template": {:hex, :phoenix_template, "1.0.4", "e2092c132f3b5e5b2d49c96695342eb36d0ed514c5b252a77048d5969330d639", [:mix], [{:phoenix_html, "~> 2.14.2 or ~> 3.0 or ~> 4.0", [hex: :phoenix_html, repo: "hexpm", optional: true]}], "hexpm", "2c0c81f0e5c6753faf5cca2f229c9709919aba34fab866d3bc05060c9c444206"},
   "phoenix_view": {:hex, :phoenix_view, "2.0.4", "b45c9d9cf15b3a1af5fb555c674b525391b6a1fe975f040fb4d913397b31abf4", [:mix], [{:phoenix_html, "~> 2.14.2 or ~> 3.0 or ~> 4.0", [hex: :phoenix_html, repo: "hexpm", optional: true]}, {:phoenix_template, "~> 1.0", [hex: :phoenix_template, repo: "hexpm", optional: false]}], "hexpm", "4e992022ce14f31fe57335db27a28154afcc94e9983266835bb3040243eb620b"},
-  "plug": {:hex, :plug, "1.16.1", "40c74619c12f82736d2214557dedec2e9762029b2438d6d175c5074c933edc9d", [:mix], [{:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.1.1 or ~> 1.2 or ~> 2.0", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4.3 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "a13ff6b9006b03d7e33874945b2755253841b238c34071ed85b0e86057f8cddc"},
+  "plug": {:hex, :plug, "1.17.0", "a0832e7af4ae0f4819e0c08dd2e7482364937aea6a8a997a679f2cbb7e026b2e", [:mix], [{:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.1.1 or ~> 1.2 or ~> 2.0", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4.3 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "f6692046652a69a00a5a21d0b7e11fcf401064839d59d6b8787f23af55b1e6bc"},
   "plug_cowboy": {:hex, :plug_cowboy, "2.7.3", "1304d36752e8bdde213cea59ef424ca932910a91a07ef9f3874be709c4ddb94b", [:mix], [{:cowboy, "~> 2.7", [hex: :cowboy, repo: "hexpm", optional: false]}, {:cowboy_telemetry, "~> 0.3", [hex: :cowboy_telemetry, repo: "hexpm", optional: false]}, {:plug, "~> 1.14", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "77c95524b2aa5364b247fa17089029e73b951ebc1adeef429361eab0bb55819d"},
   "plug_crypto": {:hex, :plug_crypto, "2.1.0", "f44309c2b06d249c27c8d3f65cfe08158ade08418cf540fd4f72d4d6863abb7b", [:mix], [], "hexpm", "131216a4b030b8f8ce0f26038bc4421ae60e4bb95c5cf5395e1421437824c4fa"},
   "postgrex": {:hex, :postgrex, "0.20.0", "363ed03ab4757f6bc47942eff7720640795eb557e1935951c1626f0d303a3aed", [:mix], [{:db_connection, "~> 2.1", [hex: :db_connection, repo: "hexpm", optional: false]}, {:decimal, "~> 1.5 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:table, "~> 0.1.0", [hex: :table, repo: "hexpm", optional: true]}], "hexpm", "d36ef8b36f323d29505314f704e21a1a038e2dc387c6409ee0cd24144e187c0f"},
   "prom_ex": {:hex, :prom_ex, "1.11.0", "1f6d67f2dead92224cb4f59beb3e4d319257c5728d9638b4a5e8ceb51a4f9c7e", [:mix], [{:absinthe, ">= 1.7.0", [hex: :absinthe, repo: "hexpm", optional: true]}, {:broadway, ">= 1.1.0", [hex: :broadway, repo: "hexpm", optional: true]}, {:ecto, ">= 3.11.0", [hex: :ecto, repo: "hexpm", optional: true]}, {:finch, "~> 0.18", [hex: :finch, repo: "hexpm", optional: false]}, {:jason, "~> 1.4", [hex: :jason, repo: "hexpm", optional: false]}, {:oban, ">= 2.10.0", [hex: :oban, repo: "hexpm", optional: true]}, {:octo_fetch, "~> 0.4", [hex: :octo_fetch, repo: "hexpm", optional: false]}, {:peep, "~> 3.0", [hex: :peep, repo: "hexpm", optional: false]}, {:phoenix, ">= 1.7.0", [hex: :phoenix, repo: "hexpm", optional: true]}, {:phoenix_live_view, ">= 0.20.0", [hex: :phoenix_live_view, repo: "hexpm", optional: true]}, {:plug, ">= 1.16.0", [hex: :plug, repo: "hexpm", optional: true]}, {:plug_cowboy, ">= 2.6.0", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:telemetry, ">= 1.0.0", [hex: :telemetry, repo: "hexpm", optional: false]}, {:telemetry_metrics, "~> 1.0", [hex: :telemetry_metrics, repo: "hexpm", optional: false]}, {:telemetry_metrics_prometheus_core, "~> 1.2", [hex: :telemetry_metrics_prometheus_core, repo: "hexpm", optional: false]}, {:telemetry_poller, "~> 1.1", [hex: :telemetry_poller, repo: "hexpm", optional: false]}], "hexpm", "76b074bc3730f0802978a7eb5c7091a65473eaaf07e99ec9e933138dcc327805"},
   "ranch": {:hex, :ranch, "2.2.0", "25528f82bc8d7c6152c57666ca99ec716510fe0925cb188172f41ce93117b1b0", [:make, :rebar3], [], "hexpm", "fa0b99a1780c80218a4197a59ea8d3bdae32fbff7e88527d7d8a4787eff4f8e7"},
+  "req": {:hex, :req, "0.5.8", "50d8d65279d6e343a5e46980ac2a70e97136182950833a1968b371e753f6a662", [:mix], [{:brotli, "~> 0.3.1", [hex: :brotli, repo: "hexpm", optional: true]}, {:ezstd, "~> 1.0", [hex: :ezstd, repo: "hexpm", optional: true]}, {:finch, "~> 0.17", [hex: :finch, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:mime, "~> 2.0.6 or ~> 2.1", [hex: :mime, repo: "hexpm", optional: false]}, {:nimble_csv, "~> 1.0", [hex: :nimble_csv, repo: "hexpm", optional: true]}, {:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: true]}], "hexpm", "d7fc5898a566477e174f26887821a3c5082b243885520ee4b45555f5d53f40ef"},
+  "saxy": {:hex, :saxy, "1.6.0", "02cb4e9bd045f25ac0c70fae8164754878327ee393c338a090288210b02317ee", [:mix], [], "hexpm", "ef42eb4ac983ca77d650fbdb68368b26570f6cc5895f0faa04d34a6f384abad3"},
   "sobelow": {:hex, :sobelow, "0.13.0", "218afe9075904793f5c64b8837cc356e493d88fddde126a463839351870b8d1e", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "cd6e9026b85fc35d7529da14f95e85a078d9dd1907a9097b3ba6ac7ebbe34a0d"},
   "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.7", "354c321cf377240c7b8716899e182ce4890c5938111a1296add3ec74cf1715df", [:make, :mix, :rebar3], [], "hexpm", "fe4c190e8f37401d30167c8c405eda19469f34577987c76dde613e838bbc67f8"},
   "telemetry": {:hex, :telemetry, "1.3.0", "fedebbae410d715cf8e7062c96a1ef32ec22e764197f70cda73d82778d61e7a2", [:rebar3], [], "hexpm", "7015fc8919dbe63764f4b4b87a95b7c0996bd539e0d499be6ec9d7f3875b79e6"},
@@ -54,6 +63,7 @@
   "telemetry_poller": {:hex, :telemetry_poller, "1.1.0", "58fa7c216257291caaf8d05678c8d01bd45f4bdbc1286838a28c4bb62ef32999", [:rebar3], [{:telemetry, "~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "9eb9d9cbfd81cbd7cdd24682f8711b6e2b691289a0de6826e58452f28c103c8f"},
   "websock": {:hex, :websock, "0.5.3", "2f69a6ebe810328555b6fe5c831a851f485e303a7c8ce6c5f675abeb20ebdadc", [:mix], [], "hexpm", "6105453d7fac22c712ad66fab1d45abdf049868f253cf719b625151460b8b453"},
   "websock_adapter": {:hex, :websock_adapter, "0.5.8", "3b97dc94e407e2d1fc666b2fb9acf6be81a1798a2602294aac000260a7c4a47d", [:mix], [{:bandit, ">= 0.6.0", [hex: :bandit, repo: "hexpm", optional: true]}, {:plug, "~> 1.14", [hex: :plug, repo: "hexpm", optional: false]}, {:plug_cowboy, "~> 2.6", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:websock, "~> 0.5", [hex: :websock, repo: "hexpm", optional: false]}], "hexpm", "315b9a1865552212b5f35140ad194e67ce31af45bcee443d4ecb96b5fd3f3782"},
+  "xlsx_reader": {:hex, :xlsx_reader, "0.8.8", "fbb29049548ff687f03a2873f2eb0d9057e47eb69cafb07f44988f030fb620b7", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}, {:saxy, "~> 1.5", [hex: :saxy, repo: "hexpm", optional: false]}], "hexpm", "642d979a3a156b150bb76a89998a130483e1c399fa32e8d3a66abc1d9799dbd7"},
   "yamerl": {:hex, :yamerl, "0.10.0", "4ff81fee2f1f6a46f1700c0d880b24d193ddb74bd14ef42cb0bcf46e81ef2f8e", [:rebar3], [], "hexpm", "346adb2963f1051dc837a2364e4acf6eb7d80097c0f53cbdc3046ec8ec4b4e6e"},
   "yaml_elixir": {:hex, :yaml_elixir, "2.11.0", "9e9ccd134e861c66b84825a3542a1c22ba33f338d82c07282f4f1f52d847bd50", [:mix], [{:yamerl, "~> 0.10", [hex: :yamerl, repo: "hexpm", optional: false]}], "hexpm", "53cc28357ee7eb952344995787f4bb8cc3cecbf189652236e9b163e8ce1bc242"},
 }

test/growth/calc/age_test.exs

@@ -0,0 +1,46 @@
+defmodule Growth.Calc.AgeTest do
+  @moduledoc false
+
+  use ExUnit.Case, async: true
+
+  alias Growth.Calc.Age
+
+  describe "calculate/2" do
+    test "consider today as date of measurement" do
+      date_of_birth = Date.add(Date.utc_today(), -7)
+      assert 7 == Age.calculate(:day, date_of_birth)
+    end
+  end
+
+  describe "calculate/3" do
+    test "calculate age in days" do
+      date_of_measurement = ~D[2024-06-09]
+      days_of_birth = [{-1, 1}, {-7, 7}, {-30, 30}]
+
+      Enum.map(days_of_birth, fn {days_ago, expected_age} ->
+        date_of_birth = Date.add(date_of_measurement, days_ago)
+        assert expected_age == Age.calculate(:day, date_of_birth, date_of_measurement)
+      end)
+    end
+
+    test "calculate age in completed weeks" do
+      date_of_measurement = ~D[2024-06-09]
+      days_of_birth = [{-1, 0}, {-7, 1}, {-16, 2}, {-30, 4}]
+
+      Enum.map(days_of_birth, fn {days_ago, expected_age} ->
+        date_of_birth = Date.add(date_of_measurement, days_ago)
+        assert expected_age == Age.calculate(:week, date_of_birth, date_of_measurement)
+      end)
+    end
+
+    test "calculate age in completed months" do
+      date_of_measurement = ~D[2024-06-09]
+      days_of_birth = [{-1, 0}, {-16, 0}, {-31, 1}, {-70, 2}, {-93, 3}]
+
+      Enum.map(days_of_birth, fn {days_ago, expected_age} ->
+        date_of_birth = Date.add(date_of_measurement, days_ago)
+        assert expected_age == Age.calculate(:month, date_of_birth, date_of_measurement)
+      end)
+    end
+  end
+end

test/growth/calc/bmi_test.exs

@@ -0,0 +1,23 @@
+defmodule Growth.Calc.BMITest do
+  @moduledoc false
+
+  use ExUnit.Case, async: true
+
+  alias Growth.Calc.BMI
+
+  describe "calculate/3" do
+    test "in metric system" do
+      weight_kg = 78.5
+      height_cm = 168.2
+
+      assert 27.74710475751505 == BMI.calculate(:metric, weight_kg, height_cm)
+    end
+
+    test "in english system" do
+      weight_lb = 173.1
+      height_in = 66.2
+
+      assert 27.770202207557876 == BMI.calculate(:english, weight_lb, height_in)
+    end
+  end
+end

test/growth/calc/centile_test.exs

@@ -0,0 +1,24 @@
+defmodule Growth.Calc.CentileTest do
+  @moduledoc false
+
+  use ExUnit.Case, async: true
+
+  import Growth.Data, only: [sample: 0]
+
+  doctest Growth.Calc.Centile
+
+  alias Growth.Calc.Centile
+
+  describe "compute/4" do
+    for %{key: key} = params <- sample() do
+      @tag params: params
+      test "returns the measure given a z-score and box-cox fitted values #{key}", %{
+        params: params
+      } do
+        %{zscore: zscore, measure: measure, l: l, m: m, s: s} = params
+
+        assert_in_delta Centile.compute(zscore, l, m, s), measure, 0.05
+      end
+    end
+  end
+end

test/growth/calc/percentile_test.exs

@@ -0,0 +1,26 @@
+defmodule Growth.Calc.PercentileTest do
+  @moduledoc false
+
+  use ExUnit.Case, async: true
+
+  doctest Growth.Calc.Percentile
+
+  alias Growth.Calc.Percentile
+
+  describe "compute/1" do
+    for {zscore, _} = params <- [
+          {-3, 0.0013498125},
+          {-2, 0.0227502617},
+          {-1, 0.1586553192},
+          {0, 0.5000000000},
+          {1, 0.8413446808},
+          {2, 0.9772497383},
+          {3, 0.9986501875}
+        ] do
+      @tag params: params
+      test "returns the percentile for z-score #{zscore}", %{params: {zscore, percentile}} do
+        assert_in_delta Percentile.compute(zscore), percentile, 0.0000005
+      end
+    end
+  end
+end

test/growth/calc/z_score_test.exs

@@ -0,0 +1,24 @@
+defmodule Growth.Calc.ZScoreTest do
+  @moduledoc false
+
+  use ExUnit.Case, async: true
+
+  import Growth.Data, only: [sample: 0]
+
+  doctest Growth.Calc.ZScore
+
+  alias Growth.Calc.ZScore
+
+  describe "compute/4" do
+    for %{key: key} = params <- sample() do
+      @tag params: params
+      test "returns a z-score given a measurement and box-cox fitted values #{key}", %{
+        params: params
+      } do
+        %{zscore: zscore, measure: measure, l: l, m: m, s: s} = params
+
+        assert_in_delta ZScore.compute(measure, l, m, s), zscore, 0.12
+      end
+    end
+  end
+end

test/growth/growth_test.exs

@@ -0,0 +1,131 @@
+defmodule GrowthTest do
+  @moduledoc false
+
+  use ExUnit.Case, async: true
+
+  doctest Growth
+
+  @child %{
+    name: "Jane Doe",
+    gender: :female,
+    date_of_measurement: Date.utc_today(),
+    age_in_days: 91,
+    weight: 5.84,
+    height: 59.78,
+    head_circumference: 39.51,
+    arm_circumference: 13.02,
+    subscapular_skinfold: 7.79,
+    triceps_skinfold: 9.75
+  }
+  @child_date_of_birth Date.shift(@child.date_of_measurement, day: @child.age_in_days * -1)
+
+  describe "new/4" do
+    test "create a new growth measurement" do
+      growth =
+        Growth.new(@child.name, @child.gender, @child_date_of_birth,
+          date_of_measurement: @child.date_of_measurement,
+          weight: @child.weight,
+          height: @child.height,
+          head_circumference: @child.head_circumference,
+          arm_circumference: @child.arm_circumference,
+          subscapular_skinfold: @child.subscapular_skinfold,
+          triceps_skinfold: @child.triceps_skinfold
+        )
+
+      assert @child.name == growth.name
+      assert @child.gender == growth.gender
+      assert @child_date_of_birth == growth.date_of_birth
+      assert @child.date_of_measurement == growth.date_of_measurement
+      assert @child.age_in_days == growth.age_in_days
+      assert 13 == growth.age_in_weeks
+      assert 2 == growth.age_in_months
+      assert @child.weight == growth.weight
+      assert @child.height == growth.height
+      assert @child.head_circumference == growth.head_circumference
+      assert @child.arm_circumference == growth.arm_circumference
+      assert @child.subscapular_skinfold == growth.subscapular_skinfold
+      assert @child.triceps_skinfold == growth.triceps_skinfold
+    end
+  end
+
+  describe "with_bmi/1" do
+    test "calculate bmi from measurement" do
+      growth =
+        %Growth{
+          name: @child.name,
+          gender: @child.gender,
+          date_of_birth: @child_date_of_birth,
+          date_of_measurement: @child.date_of_measurement,
+          weight: @child.weight,
+          height: @child.height,
+          head_circumference: @child.head_circumference,
+          arm_circumference: @child.arm_circumference,
+          subscapular_skinfold: @child.subscapular_skinfold,
+          triceps_skinfold: @child.triceps_skinfold
+        }
+        |> Growth.with_age_in_days()
+        |> Growth.with_age_in_weeks()
+        |> Growth.with_age_in_months()
+        |> Growth.with_bmi()
+
+      assert 16.341842694989243 == growth.bmi
+    end
+  end
+
+  describe "with_results/1" do
+    test "calculate z-score and percentiles from measurement" do
+      growth =
+        %Growth{
+          name: @child.name,
+          gender: @child.gender,
+          date_of_birth: @child_date_of_birth,
+          date_of_measurement: @child.date_of_measurement,
+          weight: @child.weight,
+          height: @child.height,
+          head_circumference: @child.head_circumference,
+          arm_circumference: @child.arm_circumference,
+          subscapular_skinfold: @child.subscapular_skinfold,
+          triceps_skinfold: @child.triceps_skinfold,
+          results: []
+        }
+        |> Growth.with_age_in_days()
+        |> Growth.with_age_in_weeks()
+        |> Growth.with_age_in_months()
+        |> Growth.with_bmi()
+        |> Growth.with_results()
+
+      assert [
+               day: {9.496948997971584e-4, 0.5003788733920584},
+               week: {9.496948997971584e-4, 0.5003788733920584},
+               month: {1.0060928051683196, 0.8428145353253619}
+             ] == Keyword.get(growth.results, :weight)
+
+      assert [
+               day: {0.0012831717968983271, 0.5005119113423219},
+               week: {0.0012831717968983271, 0.5005119113423219},
+               month: {1.3322618635180914, 0.9086129228760054}
+             ] == Keyword.get(growth.results, :height)
+
+      assert [
+               day: {-0.007440424136462911, 0.4970317276150869},
+               week: {-0.007440424136462911, 0.4970317276150869},
+               month: {0.3827194919327071, 0.6490361198066796}
+             ] == Keyword.get(growth.results, :bmi)
+
+      assert [
+               day: {-0.008864109494641385, 0.4964637782528006},
+               week: {-0.008864109494641385, 0.4964637782528006},
+               month: {1.0380198575748647, 0.8503695948597997}
+             ] == Keyword.get(growth.results, :head_circumference)
+
+      assert [day: {-0.004182676756535293, 0.49833135826198854}] ==
+               Keyword.get(growth.results, :arm_circumference)
+
+      assert [day: {0.001811404894950268, 0.5007226456043324}] ==
+               Keyword.get(growth.results, :subscapular_skinfold)
+
+      assert [day: {-0.0019309186728254878, 0.49922967538007906}] ==
+               Keyword.get(growth.results, :triceps_skinfold)
+    end
+  end
+end

test/growth/indicators/download_test.exs

@@ -0,0 +1,297 @@
+defmodule Growth.Indicators.DownloadTest do
+  @moduledoc false
+
+  use ExUnit.Case, async: true
+
+  alias Elixlsx.Sheet
+  alias Elixlsx.Workbook
+
+  alias Growth.Indicators.Download
+
+  setup do
+    mock_who_request()
+  end
+
+  describe "process/3" do
+    test "fetch excel from url and convert it to a list of lists" do
+      gender = :female
+      category = :age_tables
+
+      url =
+        "https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/lhfa_girls_0-to-13-weeks_zscores.xlsx"
+
+      content = Download.process(gender, category, url)
+
+      expected_content =
+        [
+          ~w(source category gender age_unit age l m s sd3neg sd2neg sd1neg sd0 sd1 sd2 sd3),
+          [
+            url,
+            category,
+            gender,
+            "week",
+            Decimal.new("0"),
+            Decimal.new("1"),
+            Decimal.new("49.1477"),
+            Decimal.new("0.0379"),
+            Decimal.new("43.6"),
+            Decimal.new("45.4"),
+            Decimal.new("47.3"),
+            Decimal.new("49.1"),
+            Decimal.new("51"),
+            Decimal.new("52.9"),
+            Decimal.new("54.7")
+          ]
+        ]
+
+      assert expected_content == content
+    end
+  end
+
+  describe "process_gender/1" do
+    test "merge multiple contents into a single one" do
+      category = :age_tables
+      gender = :female
+
+      urls =
+        [
+          "https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/lhfa_girls_0-to-13-weeks_zscores.xlsx",
+          "https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/lhfa_girls_0-to-2-years_zscores.xlsx"
+        ]
+
+      content = Download.process_gender({gender, category, urls})
+
+      expected_content =
+        [
+          ~w(source category gender age_unit age l m s sd3neg sd2neg sd1neg sd0 sd1 sd2 sd3),
+          [
+            List.first(urls),
+            category,
+            gender,
+            "week",
+            Decimal.new("0"),
+            Decimal.new("1"),
+            Decimal.new("49.1477"),
+            Decimal.new("0.0379"),
+            Decimal.new("43.6"),
+            Decimal.new("45.4"),
+            Decimal.new("47.3"),
+            Decimal.new("49.1"),
+            Decimal.new("51"),
+            Decimal.new("52.9"),
+            Decimal.new("54.7")
+          ],
+          [
+            List.last(urls),
+            category,
+            gender,
+            "month",
+            Decimal.new("0"),
+            Decimal.new("1"),
+            Decimal.new("49.1477"),
+            Decimal.new("0.0379"),
+            Decimal.new("43.6"),
+            Decimal.new("45.4"),
+            Decimal.new("47.3"),
+            Decimal.new("49.1"),
+            Decimal.new("51"),
+            Decimal.new("52.9"),
+            Decimal.new("54.7")
+          ]
+        ]
+
+      assert expected_content == content
+    end
+  end
+
+  describe "process_genders/1" do
+    test "merge multiple genders and contents into a single one" do
+      female_urls = %{
+        age_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/lhfa_girls_0-to-13-weeks_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/lhfa_girls_0-to-2-years_zscores.xlsx
+        ),
+        expanded_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/expandable-tables/lhfa-girls-zscore-expanded-tables.xlsx
+        )
+      }
+
+      male_urls = %{
+        age_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/lhfa_boys_0-to-13-weeks_zscores.xlsx
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/lhfa_boys_0-to-2-years_zscores.xlsx
+        ),
+        expanded_tables: ~w(
+          https://cdn.who.int/media/docs/default-source/child-growth/child-growth-standards/indicators/length-height-for-age/expandable-tables/lhfa-boys-zscore-expanded-tables.xlsx
+        )
+      }
+
+      content = Download.process_genders(%{female: female_urls, male: male_urls})
+
+      expected_content =
+        [
+          ~w(source category gender age_unit age l m s sd3neg sd2neg sd1neg sd0 sd1 sd2 sd3),
+          [
+            female_urls |> Map.get(:age_tables) |> List.first(),
+            :age,
+            :female,
+            "week",
+            Decimal.new("0"),
+            Decimal.new("1"),
+            Decimal.new("49.1477"),
+            Decimal.new("0.0379"),
+            Decimal.new("43.6"),
+            Decimal.new("45.4"),
+            Decimal.new("47.3"),
+            Decimal.new("49.1"),
+            Decimal.new("51"),
+            Decimal.new("52.9"),
+            Decimal.new("54.7")
+          ],
+          [
+            female_urls |> Map.get(:age_tables) |> List.last(),
+            :age,
+            :female,
+            "month",
+            Decimal.new("0"),
+            Decimal.new("1"),
+            Decimal.new("49.1477"),
+            Decimal.new("0.0379"),
+            Decimal.new("43.6"),
+            Decimal.new("45.4"),
+            Decimal.new("47.3"),
+            Decimal.new("49.1"),
+            Decimal.new("51"),
+            Decimal.new("52.9"),
+            Decimal.new("54.7")
+          ],
+          [
+            male_urls |> Map.get(:age_tables) |> List.first(),
+            :age,
+            :male,
+            "week",
+            Decimal.new("0"),
+            Decimal.new("1"),
+            Decimal.new("49.8842"),
+            Decimal.new("0.03795"),
+            Decimal.new("44.2"),
+            Decimal.new("46.1"),
+            Decimal.new("48"),
+            Decimal.new("49.9"),
+            Decimal.new("51.8"),
+            Decimal.new("53.7"),
+            Decimal.new("55.6")
+          ],
+          [
+            male_urls |> Map.get(:age_tables) |> List.last(),
+            :age,
+            :male,
+            "month",
+            Decimal.new("0"),
+            Decimal.new("1"),
+            Decimal.new("49.8842"),
+            Decimal.new("0.03795"),
+            Decimal.new("44.2"),
+            Decimal.new("46.1"),
+            Decimal.new("48"),
+            Decimal.new("49.9"),
+            Decimal.new("51.8"),
+            Decimal.new("53.7"),
+            Decimal.new("55.6")
+          ],
+          [
+            female_urls |> Map.get(:expanded_tables) |> List.first(),
+            :expanded,
+            :female,
+            "day",
+            Decimal.new("0"),
+            Decimal.new("1"),
+            Decimal.new("49.1477"),
+            Decimal.new("0.0379"),
+            Decimal.new("43.56"),
+            Decimal.new("45.422"),
+            Decimal.new("47.285"),
+            Decimal.new("49.148"),
+            Decimal.new("51.01"),
+            Decimal.new("52.873"),
+            Decimal.new("54.736")
+          ],
+          [
+            male_urls |> Map.get(:expanded_tables) |> List.first(),
+            :expanded,
+            :male,
+            "day",
+            Decimal.new("0"),
+            Decimal.new("1"),
+            Decimal.new("49.8842"),
+            Decimal.new("0.03795"),
+            Decimal.new("44.205"),
+            Decimal.new("46.098"),
+            Decimal.new("47.991"),
+            Decimal.new("49.884"),
+            Decimal.new("51.777"),
+            Decimal.new("53.67"),
+            Decimal.new("55.564")
+          ]
+        ]
+
+      assert expected_content == content
+    end
+  end
+
+  defp mock_who_request do
+    Req.Test.stub(Growth.Indicators.Download.WHO, fn %Plug.Conn{path_info: path_info} = conn ->
+      filename = List.last(path_info)
+
+      rows =
+        case filename do
+          "lhfa_girls_0-to-13-weeks_zscores.xlsx" ->
+            [
+              ~w(Week L M S SD SD3neg SD2neg SD1neg SD0 SD1 SD2 SD3),
+              ~w(0 1 49.1477 0.0379 1.8627 43.6 45.4 47.3 49.1 51 52.9 54.7)
+            ]
+
+          "lhfa_girls_0-to-2-years_zscores.xlsx" ->
+            [
+              ~w(Month L M S SD SD3neg SD2neg SD1neg SD0 SD1 SD2 SD3),
+              ~w(0 1 49.1477 0.0379 1.8627 43.6 45.4 47.3 49.1 51 52.9 54.7)
+            ]
+
+          "lhfa-girls-zscore-expanded-tables.xlsx" ->
+            [
+              ~w(Day L M S SD4neg SD3neg SD2neg SD1neg SD0 SD1 SD2 SD3 SD4),
+              ~w(0 1 49.1477 0.0379 41.697 43.56 45.422 47.285 49.148 51.01 52.873 54.736 56.598)
+            ]
+
+          "lhfa_boys_0-to-13-weeks_zscores.xlsx" ->
+            [
+              ~w(Week L M S SD SD3neg SD2neg SD1neg SD0 SD1 SD2 SD3),
+              ~w(0 1 49.8842 0.03795 1.8931 44.2 46.1 48 49.9 51.8 53.7 55.6)
+            ]
+
+          "lhfa_boys_0-to-2-years_zscores.xlsx" ->
+            [
+              ~w(Month L M S SD SD3neg SD2neg SD1neg SD0 SD1 SD2 SD3),
+              ~w(0 1 49.8842 0.03795 1.8931 44.2 46.1 48 49.9 51.8 53.7 55.6)
+            ]
+
+          "lhfa-boys-zscore-expanded-tables.xlsx" ->
+            [
+              ~w(Day L M S SD4neg SD3neg SD2neg SD1neg SD0 SD1 SD2 SD3 SD4),
+              ~w(0 1 49.8842 0.03795 42.312 44.205 46.098 47.991 49.884 51.777 53.67 55.564 57.457)
+            ]
+        end
+
+      {:ok, {_charlist_content, content}} =
+        %Sheet{name: "zscore", rows: rows}
+        |> then(&%Workbook{sheets: [&1]})
+        |> Elixlsx.write_to_memory(filename)
+
+      conn
+      |> Plug.Conn.put_resp_content_type(
+        "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
+      )
+      |> Plug.Conn.send_resp(200, content)
+    end)
+  end
+end

test/support/growth_data.ex

@@ -0,0 +1,115 @@
+defmodule Growth.Data do
+  @moduledoc """
+  Sample data for growth tests based on WHO csv files containing:
+
+  * source measure
+  * gender
+  * age_unit
+  * box-cox fitted params:
+    * l
+    * m
+    * s
+  * expeceted measure values at given z-scores:
+    * -3
+    * -2
+    * -1
+    * 0
+    * 1
+    * 2
+    * 3
+  """
+
+  NimbleCSV.define(Growth.DataCase, separator: ",", escape: "\"")
+
+  # NOTE: (jpd) this combined table will be used on zscore and centile test to cross-validate the results using
+  # different genders, ages units, and measures.
+  @sample_combined_csv """
+  source,gender,age_unit,age,l,m,s,sd3neg,sd2neg,sd1neg,sd0,sd1,sd2,sd3
+  arm-circumference-for-age,female,month,3,-0.17330000000000001,13.0284,0.082629999999999995,10.199999999999999,11.1,12,13,14.2,15.4,16.8
+  arm-circumference-for-age,female,day,91,-0.17330000000000001,13.0245,0.082619999999999999,10.218,11.066000000000001,11.999000000000001,13.023999999999999,14.154999999999999,15.401999999999999,16.78
+  arm-circumference-for-age,male,month,3,0.39279999999999998,13.4817,0.074749999999999997,10.7,11.6,12.5,13.5,14.5,15.6,16.7
+  arm-circumference-for-age,male,day,91,0.39329999999999998,13.4779,0.074740000000000001,10.657999999999999,11.554,12.493,13.478,14.507999999999999,15.585000000000001,16.709
+  body-mass-index-for-age,female,day,28,0.36370000000000002,14.4208,0.095769999999999994,10.646000000000001,11.824,13.081,14.420999999999999,15.843999999999999,17.353999999999999,18.952999999999999
+  body-mass-index-for-age,female,week,4,0.36370000000000002,14.4208,0.095769999999999994,10.6,11.8,13.1,14.4,15.8,17.399999999999999,19
+  body-mass-index-for-age,female,month,1,0.3448,14.5679,0.095560000000000006,10.8,12,13.2,14.6,16,17.5,19.100000000000001
+  body-mass-index-for-age,male,day,28,0.28810000000000002,14.7714,0.090719999999999995,11.125999999999999,12.26,13.474,14.771000000000001,16.155000000000001,17.629000000000001,19.196000000000002
+  body-mass-index-for-age,male,week,4,0.28810000000000002,14.7714,0.090719999999999995,11.1,12.3,13.5,14.8,16.2,17.600000000000001,19.2
+  body-mass-index-for-age,male,month,1,0.27079999999999999,14.944100000000001,0.090270000000000003,11.3,12.4,13.6,14.9,16.3,17.8,19.399999999999999
+  head-circumference-for-age,female,day,28,1,36.376100000000001,0.032149999999999998,32.868000000000002,34.036999999999999,35.207000000000001,36.375999999999998,37.545999999999999,38.715000000000003,39.884999999999998
+  head-circumference-for-age,female,week,4,1,36.376100000000001,0.032149999999999998,32.9,34,35.200000000000003,36.4,37.5,38.700000000000003,39.9
+  head-circumference-for-age,female,month,1,1,36.546300000000002,0.032099999999999997,33,34.200000000000003,35.4,36.5,37.700000000000003,38.9,40.1
+  head-circumference-for-age,male,day,28,1,37.092599999999997,0.031480000000000001,33.590000000000003,34.756999999999998,35.924999999999997,37.093000000000004,38.26,39.427999999999997,40.595999999999997
+  head-circumference-for-age,male,week,4,1,37.092599999999997,0.031480000000000001,33.6,34.799999999999997,35.9,37.1,38.299999999999997,39.4,40.6
+  head-circumference-for-age,male,month,1,1,37.2759,0.031329999999999997,33.799999999999997,34.9,36.1,37.299999999999997,38.4,39.6,40.799999999999997
+  length-height-for-age,female,day,28,1,53.380899999999997,0.036470000000000002,47.54,49.487000000000002,51.433999999999997,53.381,55.328000000000003,57.274999999999999,59.220999999999997
+  length-height-for-age,female,week,4,1,53.380899999999997,0.036470000000000002,47.5,49.5,51.4,53.4,55.3,57.3,59.2
+  length-height-for-age,female,month,1,1,53.687199999999997,0.036400000000000002,47.8,49.8,51.7,53.7,55.6,57.6,59.5
+  length-height-for-age,male,day,28,1,54.388100000000001,0.035700000000000003,48.563000000000002,50.505000000000003,52.445999999999998,54.387999999999998,56.33,58.271000000000001,60.213000000000001
+  length-height-for-age,male,week,4,1,54.388100000000001,0.035700000000000003,48.6,50.5,52.4,54.4,56.3,58.3,60.2
+  length-height-for-age,male,month,1,1,54.724400000000003,0.035569999999999997,48.9,50.8,52.8,54.7,56.7,58.6,60.6
+  subscapular-skinfold-for-age,female,day,91,-0.2019,7.7873999999999999,0.18428,4.6109999999999998,5.4580000000000002,6.4989999999999997,7.7869999999999999,9.3960000000000008,11.422000000000001,13.994999999999999
+  subscapular-skinfold-for-age,female,month,3,-0.2026,7.7846000000000002,0.18428,4.5999999999999996,5.5,6.5,7.8,9.4,11.4,14
+  subscapular-skinfold-for-age,male,day,91,-0.30299999999999999,7.6920000000000002,0.17019000000000001,4.7850000000000001,5.5640000000000001,6.516,7.6920000000000002,9.1609999999999996,11.016999999999999,13.395
+  subscapular-skinfold-for-age,male,month,3,-0.30330000000000001,7.6898999999999997,0.17019999999999999,4.8,5.6,6.5,7.7,9.1999999999999993,11,13.4
+  triceps-skinfold-for-age,female,day,91,0.18820000000000001,9.7532999999999994,0.17524999999999999,5.6070000000000002,6.7869999999999999,8.1609999999999996,9.7530000000000001,11.589,13.695,16.102
+  triceps-skinfold-for-age,female,month,3,0.1875,9.7515999999999998,0.17535000000000001,5.6,6.8,8.1999999999999993,9.8000000000000007,11.6,13.7,16.100000000000001
+  triceps-skinfold-for-age,male,day,91,0.0030000000000000001,9.7658000000000005,0.16611000000000001,5.931,7.0039999999999996,8.2710000000000008,9.766,11.53,13.612,16.068000000000001
+  triceps-skinfold-for-age,male,month,3,0.0027000000000000001,9.7638999999999996,0.16617999999999999,5.9,7,8.3000000000000007,9.8000000000000007,11.5,13.6,16.100000000000001
+  weight-for-age,female,day,28,0.1789,4.0987,0.13805000000000001,2.665,3.0880000000000001,3.5640000000000001,4.0990000000000002,4.6980000000000004,5.3659999999999997,6.1120000000000001
+  weight-for-age,female,week,4,0.1789,4.0987,0.13805000000000001,2.7,3.1,3.6,4.0999999999999996,4.7,5.4,6.1
+  weight-for-age,female,month,1,0.1714,4.1872999999999996,0.13724,2.7,3.2,3.6,4.2,4.8,5.5,6.2
+  weight-for-age,male,day,28,0.2331,4.3670999999999998,0.13497000000000001,2.8540000000000001,3.3050000000000002,3.8069999999999999,4.367,4.9880000000000004,5.6740000000000004,6.43
+  weight-for-age,male,week,4,0.2331,4.3670999999999998,0.13497000000000001,2.9,3.3,3.8,4.4000000000000004,5,5.7,6.4
+  weight-for-age,male,month,1,0.22969999999999999,4.4709000000000003,0.13395000000000001,2.9,3.4,3.9,4.5,5.0999999999999996,5.8,6.6
+  """
+
+  @doc """
+  Sample data to validate calculation made to convert measure into z-score and vice-versa.
+
+  This data is based on values extracted from WHO csv files.
+  """
+  @spec sample :: [
+          %{
+            key: String.t(),
+            zscore: number(),
+            measure: number(),
+            l: number(),
+            m: number(),
+            s: number()
+          }
+        ]
+  def sample do
+    @sample_combined_csv
+    |> Growth.DataCase.parse_string()
+    |> Enum.flat_map(fn [
+                          source,
+                          gender,
+                          age_unit,
+                          age,
+                          l,
+                          m,
+                          s,
+                          sd3n,
+                          sd2n,
+                          sd1n,
+                          sd0,
+                          sd1,
+                          sd2,
+                          sd3
+                        ] ->
+      key = "#{source}:#{gender}:#{age_unit}:#{age}"
+
+      [l, m, s, sd3n, sd2n, sd1n, sd0, sd1, sd2, sd3] =
+        Enum.map(
+          [l, m, s, sd3n, sd2n, sd1n, sd0, sd1, sd2, sd3],
+          &(&1 |> Float.parse() |> elem(0))
+        )
+
+      [-3.0, -2.0, -1.0, 0.0, 1.0, 2.0, 3.0]
+      |> Enum.zip([sd3n, sd2n, sd1n, sd0, sd1, sd2, sd3])
+      |> Enum.map(fn {zscore, measure} ->
+        %{key: "#{key}:#{zscore}", zscore: zscore, measure: measure, l: l, m: m, s: s}
+      end)
+    end)
+  end
+end