|
Characteristics
|
Boys(n = 1525)
|
Girls (n = 2019)
|
Total (n = 3544)
|
t or χ2
|
|---|
|
Age (years)
| | | | |
| |
15.6 ± 0.6
|
15.6 ± 0.8
|
15.6 ± 0.7
|
-1.39
|
|
Weight Status1
| | | | |
|
Underweight
|
5.1%
|
5.8%
|
5.5%
|
142.91***
|
|
Normal weight
|
72.5%
|
85.8%
|
82.8%
| |
|
Overweight
|
14.8%
|
6.2%
|
10.5%
| |
|
Obese
|
7.5%
|
2.1%
|
4.8%
| |
|
Perceived body weight
| | | | |
|
Underweight
|
28.1%
|
16.9%
|
21.7%
|
85.47***
|
|
Normal weight
|
45.8%
|
46.6%
|
46.3%
| |
|
Overweight
|
21.6%
|
32.1%
|
27.6%
| |
|
Obese
|
3.8%
|
4.0%
|
3.9%
| |
|
Father's Educational Level2
| | | | |
|
Low
|
24.7%
|
28.5%
|
26.8%
|
19.94***
|
|
Middle
|
53.9%
|
55.7%
|
31.6%
| |
|
High
|
21.4%
|
15.8%
|
18.2%
| |
|
Mother's Educational Level2
| | | | |
|
Low
|
30.4%
|
34.3%
|
32.6%
|
24.12***
|
|
Middle
|
53.5%
|
55.1%
|
54.4%
| |
|
High
|
16.0%
|
10.6%
|
12.9%
| |
|
Family's Income3
| | | | |
|
Low
|
21.7%
|
29.1%
|
25.9%
|
50.12***
|
|
Middle
|
51.9%
|
53.2%
|
52.7%
| |
|
High
|
26.4%
|
17.6%
|
21.4%
| |
|
Father employment status4
| | | | |
|
Yes
|
78.3%
|
61.1%
|
69.7%
|
0.11
|
|
No
|
21.7%
|
38.9%
|
30.3%
| |
|
Mother employment status4
| | | | |
|
Yes
|
68.3%
|
64.1%
|
66.2%
|
6.87**
|
|
No
|
31.7%
|
35.9%
|
33.8%
| |
-
1 Defined according to the Chinese reference developed by the Working Group for Obesity in China (WGOC).
-
2 Educational level: Low: lower than junior middle school; Middle: high middle school; High: college/university or above
-
3 Family's income: Low: < 2000 Yuan/Month; Middle: 2000-6000 Yuan/Month; High: ≥6000 Yuan/Month
-
4 Parents' employment status: yes: have a job; no: housework, job-waiting/laid off, and retired.
- Significant difference between boys and girls, t-test for means or χ2-test for proportion, ** P < 0.01, *** P < 0.001.
