| |
Total
|
Boys
|
Girls
|
P value
|
|---|
|
Demographics
|
|
No. of participants
|
18,302
|
8624
|
9678
|
–
|
|
Age (years)
|
11.32(3.16)
|
11.29(0.04)
|
11.49(0.04)
|
0.001
|
|
From Northern area (%)
|
40.4
|
40.5
|
40.2
|
< 0.001
|
|
Monthly income of Family (%)
| | | |
0.012
|
|
≤ 5000 yuan
|
30.5
|
29.8
|
31.0
| |
|
> 5000 yuan
|
13.9
|
13.5
|
14.4
| |
|
Not willing to answer
|
55.6
|
56.7
|
54.6
| |
|
Mother’s education year (%)
| | | |
0.01
|
|
≤ 9
|
43.7
|
55.0
|
51.9
| |
|
10–12
|
20.4
|
25.6
|
25.6
| |
|
13–16
|
11.9
|
11.0
|
12.6
| |
|
≥ 16
|
9.8
|
9.8
|
9.8
| |
|
Puberty on-set (%)
|
56.1
|
43.4
|
65.2
|
< 0.001
|
|
Height(cm)
|
147.26(16.12)
|
148.95(0.22)
|
146.93(0.21)
|
< 0.001
|
|
Weight(kg)
|
39.46(12.57)
|
40.56(0.17)
|
39.29(0.16)
|
< 0.001
|
|
BMI
|
17.73(2.26)
|
17.65(0.03)
|
17.73(0.03)
|
0.078
|
|
Dietary intake (servings/day)
|
|
Fruit
|
1.27(1.06)
|
1.25(0.01)
|
1.30(0.01)
|
0.006
|
|
Vegetable
|
1.79(1.40)
|
1.81(0.02)
|
1.79(0.02)
|
0.27
|
|
Meat
|
1.17(1.21)
|
1.32(0.02)
|
1.02(0.02)
|
< 0.001
|
|
Sugar beverage
|
0.41(0.74)
|
0.50(0.01)
|
0.33(0.01)
|
< 0.001
|
|
Physical Activity (PA)
|
|
HLPA (hour/day)
|
0.47(0.69)
|
0.61(0.01)
|
0.45(0.01)
|
< 0.001
|
|
MLPA (hour/day)
|
0.48(0.72)
|
0.53(0.01)
|
0.44(0.01)
|
< 0.001
|
|
Walking (hour/day)
|
0.78(1.13)
|
0.84(0.02)
|
0.74(0.02)
|
< 0.001
|
|
Sedentary (hour/week)
|
39.38(25.72)
|
38.40(0.35)
|
40.05(0.02)
|
< 0.001
|
|
Sleep duration (%)
|
|
< 7 h
|
18.3
|
16.8
|
19.6
|
< 0.001
|
|
7–9 h
|
57.3
|
57.8
|
56.9
|
|
> 9 h
|
24.4
|
25.4
|
23.5
|
- Continuous variables are displayed as mean (standard error, for boys and girls) and mean (standard deviation, for total), categorical variables are displayed as proportion. P values are from T-tests (continuous variables) and chi-square tests (categorical variables) between boys and girls
- BMI body mass index, PA physical activity, HLPA high level physical activity, MLPA middle level activity
