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National Statistics

National Child Measurement Programme, England - 2017/18 School Year [PAS]

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Data Quality – Missing and imprecise data

Missing data

The proportion of missing data items has improved over time although it still remains quite high for NHS number and ethnicity. 27 LAs had over 25% of records with missing NHS numbers and nine LAs had more than 25% of records without an ethnicity code.

Percentage of missing data for ethnicity, child postcode and NHS number


Imprecise data

By chance, 10% of height and weight measurements would be expected to be whole numbers. However, there is some evidence of LAs rounding heights to whole numbers as nationally 16% of heights were whole numbers in 2017/18. This was over 30% for two LAs.

Percentage of whole number heights and weights


1. NHS number has only been collected since 2013/14.

2. For 2017/18 data at local authority level: Table 8, National Child Measurement Programme, England, 2017/18 school year.

Last edited: 4 October 2018 11:57 am