anthro

WHO 2006 Child Growth Standards — z-scores and nutritional classifications for 6 indicators.

Website: https://flame-cai.github.io/anthro
Version: 1.1.1

Available for JavaScript / Node.js (@flame-cai/anthro on npm) and Python (anthro on PyPI).

---

JavaScript

Install

npm install @flame-cai/anthro

Or clone and use directly:

git clone https://github.com/flame-cai/anthro.git

Quick start

const { createAnthro } = require('@flame-cai/anthro')
const fs = require('fs')

const names = ['wfa', 'lhfa', 'bmi', 'acfa', 'wfl', 'wfh']
const load  = (p, n) => JSON.parse(fs.readFileSync(require.resolve(`@flame-cai/anthro/data/${p}_${n}.json`)))

const anthro = createAnthro(
  Object.fromEntries(names.map(n => [n, load('day',   n)])),
  Object.fromEntries(names.map(n => [n, load('month', n)]))
)

const result = anthro.compute({
  mode:      'day',
  sex:       'female',
  dob:       '2024-01-15',
  weight_kg: 7.0,
  height_cm: 64.0,
  muac_mm:   136,
})

result.lhfa            // 'Moderately stunted'
result.z_lhfa          // -2.7901
result.wfa             // 'Normal'
result.muac_threshold  // 'Normal'
result.bmi_val         // 17.0898

Full documentation: https://flame-cai.github.io/anthro/#/docs

---

Python

Install

pip install anthro

Quick start

from anthro import compute, batch

result = compute({
    'sex':       'female',
    'dob':       '2024-01-15',
    'measured':  '2025-01-15',
    'weight_kg': 7.0,
    'height_cm': 64.0,
    'muac_mm':   136,
})

result['lhfa']            # 'Moderately stunted'
result['z_lhfa']          # -2.7901
result['wfa']             # 'Normal'
result['muac_threshold']  # 'Normal'
result['bmi_val']         # 17.0898

# Batch
results = batch([
    {'sex': 'm', 'age_days': 200, 'weight_kg': 6.8, 'height_cm': 63.0},
    {'sex': 'f', 'age_days': 400, 'weight_kg': 8.2, 'height_cm': 75.0},
])

See python/README.md for full Python API reference.

---

Output indicators

Field	Description
muac_threshold	Absolute MUAC (age-independent): SAM / MAM / Normal
acfa	MUAC-for-age z-score (3–60 m)
bmi	BMI-for-age z-score (0–60 m)
lhfa	Length/height-for-age — stunting (0–60 m)
wfa	Weight-for-age — underweight (0–60 m)
wflh	Weight-for-length/height — wasting (0–60 m)

Missing inputs return a descriptive string, not null / None.

Tables

data/day_*.json — WHO igrowup day-indexed (1 row/day, 0–1826 d). Preferred when DOB is known.
data/month_*.json — WHO supplementary monthly (1 row/month, 0–60 m).

Shared between the JS and Python packages — no duplication.

Source: WHO MGRS (2006). ISBN 924154693X.

Versioning

The single source of truth is VERSION. Both packages read from it:

• npm — package.json version is synced by CI before publish (npm run sync-version)
• PyPI — pyproject.toml uses [tool.hatch.version] pointing at VERSION
• JS source — src/anthro.js version string is updated by CI before publish

To cut a release: update VERSION, commit, push git tag vX.Y.Z && git push origin vX.Y.Z.

Contributing

See CONTRIBUTING.md.