At the end of the school year, the height and weight results are sent to the Public Health Wales Observatory who will analyse the data and look for trends at a local level, at a health board level and nationally to learn how children are growing. The data will be used in a way in which your child cannot be identified.
Height and weight results are first used to calculate Body Mass Index Centile (BMI Centile). The BMI Centiles are then grouped together by the Public Health Wales Observatory and used to compare how children are growing in different parts of Wales.