Skip to main content

National Child Measurement Programme

The National Child Measurement Programme (NCMP) measures the height and weight of children in Reception class (aged 4 to 5) and year 6 (aged 10 to 11), to assess overweight and obesity levels in children within primary schools.

The data can be used nationally to support local public health initiatives, and locally to inform the planning and delivery of services for children. The programme is recognised internationally as a world-class source of public health intelligence and holds UK National Statistics status.

The programme was set up in line with the government's strategy to tackle obesity, and to:

  • inform local planning and delivery of services for children
  • gather population-level data to allow analysis of trends in growth patterns and obesity
  • increase public and professional understanding of weight issues in children and
  • be a vehicle for engaging with children and families about healthy lifestyles and weight issues.

Heights and weights are measured and used to calculate a Body Mass Index (BMI) centile. The measurement process is overseen by trained healthcare professionals in schools.

Defining overweight and obesity in children

Defining children as overweight or obese is a complex process, given that children of different ages and sexes grow and develop at different rates.

This means that a different method is used for children than for adults.

BMI is calculated by dividing their weight (in kilograms) by the square of their height (in metres), and for children, this is then compared to a reference sample of measurements gathered in 1990, which takes age and sex into account.

Further information is available in a guide to classifying body mass index in children produced by Office for Health Improvement and Disparities (OHID), which is part of the Department for Health and Social Care.

Taking part in the programme

Before the programme starts each school year, local authorities write to the parents and carers of all children eligible for measurement to inform them of the programme.

Parents or carers can choose to withdraw their child from the process by responding to the letter.

How the data is collected

Local authorities are asked to collect data on Reception Year and Year 6 children's height and weight from all state maintained schools within their area.

Prior to a legislation change in 2013, this role was fulfilled by NHS primary care trusts.

The data is submitted to NHS England, and all of the returns are collated and validated centrally.

OHID provide operational guidance to local authorities and schools on how to undertake the exercise, which states:

  • local authorities will take steps to ensure that parents receive a letter explaining the purpose of the programme, and provide them with the opportunity to withdraw their child from it
  • if local authorities are routinely feeding back results to parents, they aim to do this within 6 weeks of measurement
  • the privacy and dignity of the child must be safeguarded at all times, and the measurement is to be done sensitively in a private setting
  • individual children's results will not be shared with school staff or other pupils, and suppression and disclosure controls will be implemented when the data set and publication is released to ensure that individual children cannot be identified

How the data is used

NHS England use the data to produce National Statistics Reports showing trends at national level, differences between groups of pupils and the latest local authority level data.

The data is also shared with the OHID Obesity Risk Factors Intelligence team (OHID Obesity RFI) but in a form that in no way could lead to an individual child being identified. OHID present the data in an online tool that enables the user to examine patterns and trends at local authority level.

No information is ever published by NHS England or OHID in a way that could lead to individual children being identified.

The information may also be linked with previous height and weight measurements and other data, such as dental survey or hospital episode statistics, or provided to other organisations, such as universities for research into health and social care. Any linkage or sharing with other organisations is subject to approval from an independent group of experts.

NHS England has shared the data with OHID for linkage to their dental survey data. The data shared with OHID was in a form that no child be identified. A link to the report from this study will be included here when it becomes available.

NHS England has also shared the data with the University of Essex to assess the impact of the Universal Free School Meals programme for children in Key Stage 1 on child weight. A report will be published and a link made available here in due course. The data shared did not include any child level data.

Contact details

If you have an enquiry about the National Child Measurement Programme, please call 0300 303 5678 or email [email protected].

Further information

internal IT system - overview and requirements

The National Child Measurement Programme (NCMP) system offers a range of approaches to record data at the point of measurement. Organisations need to choose which approach is best for them and any providers collecting data on their behalf.

internal IT system

Find out about the National Child Measurement Programme (NCMP) IT system, including how to access it and guidance documentation.

internal User access controls

Access to the new National Child Measurement Programme (NCMP) IT system is controlled at a local authority level. Access is given if there's a clear business need and in line with the requirements of the Data Protection Act 2018 - the UK's implementation of the General Data Protection Regulation (GDPR).


Last edited: 7 December 2023 2:21 pm