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Child growth percentile calculation explained with LMS method and edge cases

By PulseAugur Editorial · [1 sources] ·

This article details the LMS method used by the WHO and CDC to calculate child growth percentiles, explaining the mathematical formulas for median (M), coefficient of variation (S), and Box-Cox power (L). It provides TypeScript code for converting measurements to z-scores and then to percentiles, including a standard normal CDF approximation. The post also highlights several edge cases encountered in implementation, such as the precise definition of a month and the interpolation needed for CDC data points that fall between whole months. AI

IMPACT Provides a detailed technical explanation of a statistical method used in health data, relevant for developers building AI tools in healthcare or data analysis.

RANK_REASON The item describes a specific mathematical method and its implementation for calculating growth percentiles, including code and edge cases, which falls under research and technical explanation. [lever_c_demoted from research: ic=1 ai=0.4]

Read on dev.to — MCP tag →

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Child growth percentile calculation explained with LMS method and edge cases

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The item describes a specific mathematical method and its implementation for calculating growth percentiles, including code and edge cases, which falls under research and technical explanation. [le…
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COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · Dr. Barış Öztürk, MD ·

    How WHO and CDC growth percentiles are computed (the LMS method), and the edge cases we hit

    <p>I'm an emergency physician, and I also write the code behind Growo, a set of child growth calculators in 17 languages and an MCP server that AI assistants can call. Parents kept asking me what the percentile on their child's chart meant. Answering properly meant computing it t…

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