Table 1 Characteristics of 4-year-old children with valid Actiheart data (n = 593).

Female (n (%))

Age (years)

Ethnicity (% non-white)

Children attend childcare full time

BMI z-score

Weight status (IOTF classification) (n (%))

 Underweight

 Normal

 Overweight/Obese

Age mother left education (n (%))

 ≤16 years

 17-18 years

 ≥18 years

Season of measurement (n (%))

 Winter

 Spring

 Summer

 Autumn