|
All
|
Boys
|
Girls
|
p value for difference
|
---|
(n = 845)
|
(n = 368)
|
(n = 477)
|
---|
Demographic variables
|
Age
|
14·5 (0·5)
|
14·5 (0·5)
|
14·6 (0·5)
|
0·04
|
BMI z-score
|
0·20 (1·06)
|
0·19 (1·08)
|
0·20 (1·04)
|
0·83
|
Deprivation rank
|
24,455 (1199, 32319)
|
24,4890 (6098, 32319)
|
24,455 (1199, 32319)
|
0·20a
|
MFQ
|
13 (8–20)
|
11 (7–17)
|
15 (8–23)
|
<0·001a
|
Objective sedentary (mean hr/day)
|
Sedentary
|
6·1 (2·1)
|
5·6 (2·0)
|
6·5 (2·1)
|
<0·001
|
Objective physical activity (median (IQR) min/day)
|
MVPA
|
38·8 (19·7-65·1)
|
56·4 (31·2- 82·9)
|
28·0 (14·0- 48·6)
|
<0·001a
|
Self-reported sedentary (median (IQR) hr/day)
|
Combined variables
|
Screen time
|
4·0 (2·8-5·5)
|
4·3 (3·1-5·7)
|
3·7 (2·6-5·1)
|
<0·001a
|
Non screen sedentary
|
1·5 (1·0-2·3)
|
1·3 (0·7-2·0)
|
1·6 (1·1-2·6)
|
<0·001a
|
Individual variables
|
TV viewing
|
1·9 (1·2-2·7)
|
1·9 (1·3-2·9)
|
1·9 (1·1-2·7)
|
0·436a
|
Internet Use
|
1·3 (0·6-2·3)
|
1·1 (0·5-2·0)
|
1·6 (0·9-2·4)
|
<0·001a
|
Computer Games
|
0·1 (0·0-0·9)
|
0·9 (0·3-1·6)
|
0·0 (0·0-0·1)
|
<0·001a
|
Homework
|
1·0 (0·6-1·6)
|
1·0 (0·6-1·3)
|
1·2 (0·8-1·8)
|
<0·001a
|
Reading
|
0·3 (0·0-0·8)
|
0·2 (0·0-0·6)
|
0·5 (0·0-0·8)
|
<0·001a
|
Academic achievement
|
Total points1
|
416·6 (117·5)
|
394·1 (115·1)
|
434·0 (116·6)
|
<0·001
|
-
aWilcoxon-Mann–Whitney test
-
1Calculated to include GCSE and GNVQ results e.g., for GCSEs A* = 58, A = 52…G = 16, and similar for GNVQ grades