Table 1 Characteristics of the study population by sex (mean ± SD; n = 1568)

Age (y)

10.2 ± 0.3

10.3 ± 0.3

Ethnicity (% non-white)

3.6

3.8

SES - parental education (%)

   - GCSE or lower

35.8

40.0

   - up to A level

42.7

39.8

   - higher education

21.5

20.2

Height (cm)

141.0 ± 6.5

141.1 ± 6.7

Weight (kg)

35.7 ± 7.5

37.2 ± 8.8¹

BMI (kg/m²)

17.8 ± 2.8

18.5 ± 3.3¹

Weight status (%)

   - overweight

15.3

19.4¹

   - obese

3.6

6.0

   Total PA (counts/min)

716.4 ± 227.1

639.9 ± 215.7¹

Sedentary (min/day)

450.4 ±56.5

462.7 ± 52.0¹

Light (min/day)

186.0 ± 32.5

180.1 ± 31.3¹

Moderate (min/day)

54.2 ± 14.8

44.5 ± 12.3¹

Vigorous (min/day)

29.7 ± 14.4

21.7 ± 11.2¹

MVPA (min/day)

84.0 ± 25.8

66.3 ± 20.9¹

Registered Time (mins)

720.4 ± 61.0

709.1 ± 58.6¹

Meeting PA recommendations

   - ≥60 min/day MVPA (%)

81.2

60.1¹