Table 1 Children’s objectively measured sedentary time and self-reported screen-time at 3 time-points (values are mean ± SD unless stated otherwise)

Accelerometer Sedentary time, % of wear time

All

62.2 ± 6.3

63.5 ± 6.3

70.2 ± 6.5

Boys

61.1 ± 6.7

62.4 ± 6.4

69.6 ± 7.2

Girls

63.1 ± 5.9**

64.3 ± 6.0**

70.8 ± 5.6

Accelerometer Sedentary time, Hrs/wk

All

34.9 ± 5.3

35.6 ± 5.0

40.3 ± 5.3

Boys

34.6 ± 5.6

35.1 ± 5.3

40.3 ± 5.8

Girls

35.2 ± 5.1*

36.0 ± 4.8*

40.4 ± 4.8

T ₀ (n = 1745)

T _4y (n = 373)

44.0% male, 10.3 (0.3)y

45.0% male, 14.3 (0.3)y

Self-reported screen-time, Hrs/wk, median (IQR)

All

6.9 (2.9−14.8)

-

15.1 (8.5−26.0)

Boys

8.1 (3.3−16.6)

-

15.2 (8.9−25.5)

Girls

6.1 (2.6−13.2)**

-

15.0 (8.3−26.0)