Table 1 Basic information of participants
N(%) | |
|---|---|
Total | 38744 |
Gender | |
Boys | 19631(50.7) |
Girls | 19113(49.3) |
Age(years) | |
6–12 | 23456(60.5) |
13–17 | 15288(39.5) |
Areas | |
Big Cities | 8646(22.3) |
Medium and Small Cities | 10825(27.9) |
Ordinary rural areas | 12130(31.3) |
Poor rural areas | 7143(18.5) |