| All n = 5595 | Boys n = 2662 | Girls n = 2933 | p Value | |
| Age (years) | 11.8 (11.6–11.9) | 11.7 (11.6–11.9) | 11.8 (11.6–11.9) | NS |
| Height (cm) | 150.5 (145.7–155.4) | 149.6 (144.9–154.6) | 151.3 (146.3–156.2) | <0.001 |
| Weight (kg) | 41.6 (36.2–49.0) | 40.4 (35.6–47.2) | 42.8 (37.0–50.4) | <0.001 |
| BMI (kg/m2) | 18.7 (16.6–20.7) | 18.5 (6.4–20.4) | 19.0 (16.7–21.1) | <0.001 |
| Overall activity (counts/min) | 580 (474–710) | 644 (528–772) | 529 (444–638) | <0.001 |
| Physical activity weekdays (counts/min) | 579 (475–715) | 644 (533–784) | 529 (445–635) | <0.001 |
| Physical activity weekend (counts/min) | 548 (413–723) | 599 (443–791) | 510 (390–656) | <0.001 |
| Sedentary activity* (min/day) | 430 (384–474) | 420 (373–464) | 440 (394–482) | <0.001 |
| Light activity* (min/day) | 322 (284–362) | 330 (291–371) | 315 (278–353) | <0.001 |
| Moderate activity* (min/day) | 17 (10–27) | 22 (14–33) | 13 (8–21) | <0.001 |
| Vigorous activity* (min/day) | 2 (1–4) | 3 (1–5) | 2 (1–3) | <0.001 |
| MVPA (min/day) | 20 (12–31) | 25 (16–38) | 16 (10–25) | <0.001 |
| Proportion of children meeting recommended activity level† (%, 95% CI) | 2.5 (2.1 to 2.9) | 5.1 (4.3 to 6.0) | 0.4 (0.2 to 0.7) | <0.001 |
BMI, body mass index; MVPA, moderate to vigorous physical activity.
Data are median and interquartile range (IQR) unless otherwise stated.
p Values relate to sex differences.
Small discrepancies in totals are due to rounding errors.
*Cutpoints used: sedentary = <200; light = 200–3599; moderate = 3600–6199; vigorous = 6200+.
†Recommended activity level ⩾60 min of MVPA activity daily.