Guidance

National Child Measurement Programme (NCMP) annual report: methodology

Details the methods used in annual NCMP reports, including calculations, statistical testing and body mass index (BMI) classification.

• From: Office for Health Improvement and Disparities
• Published: 4 November 2025

Applies to England

Documents

NCMP annual report: methodology

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Details

This methodology report accompanies the National Child Measurement Programme (NCMP) annual reports.

Each report presents data, patterns and trends in prevalence in body mass index (BMI) categories for children in reception (aged 4 to 5 years) and year 6 (aged 10 to 11 years) each academic year in England.

This document includes information on:

• data collection, validation and quality
• calculation of prevalence and confidence intervals
• statistical testing
• the methods used for BMI classification in the annual report