| |
Cross-sectional samples
|
Prospective sample
|
|---|
|
9-y-olds
|
n
|
15-y-olds
|
n
|
Baseline
|
n
|
Follow-up
|
n
|
|---|
|
Girls
|
49.4%
| |
51.0%
| |
48.9%
| |
48.9%
| |
|
Age (years)
|
9.6 (0.4)
|
2366
|
15.3 (0.6)
|
1554
|
9.6 (0.4)
|
517
|
15.2 (0.7)
|
517
|
|
Height (cm)
|
138.7 (6.6)
|
2342
|
169.6 (8.3)
|
1490
|
139.1 (6.4)
|
515
|
169.8 (8.4)
|
477
|
|
Weight (kg)
|
33.9 (6.8)
|
2343
|
60.7 (11.4)
|
1474
|
33.4 (6.3)
|
515
|
59.8 (10.5)
|
469
|
|
BMI (kg∙m−2)
|
17.5 (2.6)
|
2340
|
21.0 (3.3)
|
1473
|
17.2 (2.4)
|
515
|
20.7 (3.0)
|
469
|
|
SES
|
|
Low
|
6.8%
|
153
|
5.9%
|
82
|
5.8%
|
29
|
5.8%
|
29
|
|
Middle
|
37.7%
|
843
|
38.8%
|
543
|
35.5%
|
179
|
35.5%
|
179
|
|
High
|
55.5%
|
1243
|
55.4%
|
776
|
58.7%
|
296
|
58.7%
|
296
|
|
Acc. WT (min/d)
|
804.5 (64.5)
|
2366
|
840.2 (89.5)
|
1554
|
817.4 (66.7)
|
517
|
824.5 (84.5)
|
517
|
|
MVPA (min/d)
|
92.1 (30.6)
|
2366
|
68.6 (26.3)
|
1554
|
98.2 (33.3)
|
517
|
69.5 (25.6)
|
517
|
|
Sleep (hrs/d)a
|
9.7 (0.8)
|
2102
|
8.1 (0.9)
|
1165
|
10.3 (0.6)
|
478
|
7.5 (0.7)
|
382
|
|
Screen time (hrs/d)
|
2.6 (1.3)
|
2081
|
3.9 (1.6)
|
1209
|
2.4 (1.3)
|
476
|
3.9 (1.6)
|
399
|
|
Active transport
|
|
0–5 min/d
|
43.7%
|
926
|
52.3%
|
652
|
38.6%
|
188
|
48.9%
|
204
|
|
6–15 min/d
|
35.8%
|
757
|
36.1%
|
450
|
40.5%
|
197
|
36.7%
|
153
|
|
≥ 16 min/d
|
20.5%
|
434
|
11.6%
|
1247
|
20.9%
|
102
|
14.4%
|
60
|
|
Sports/exercise
|
|
≤ 2 h/week
|
36.1%
|
762
|
30.2%
|
373
|
30.8%
|
150
|
28.6%
|
117
|
|
3–7 h/week
|
53.1%
|
1119
|
46.8%
|
577
|
56.1%
|
273
|
43.8%
|
179
|
|
≥ 8 h/week
|
10.8%
|
228
|
23.0%
|
284
|
13.1%
|
64
|
27.6%
|
113
|
- SES, socioeconomic status; Acc. WT, accelerometer wear time; MVPA, moderate-to-vigorous physical activity; hrs/d, hours per day; min/d, minutes per day; hrs/week, hours per week. aPossible range 7.5–13.0 h/night (PANCS1); 5.5–13.0 h/night (PANCS2/pooled)
