In general, children's behavioural characteristics at entry to primary school were similar to those reported when they were aged 3. (gov.scot)
People who display similar behavioural characteristics tend to move their bodies in the same way. (sciencedaily.com)
This suggests therefore, that for many children the particular patterns of social, emotional and behavioural characteristics observed at school entry are determined at an earlier stage in their lives. (gov.scot)