Table 1. The distribution of the studied children.
Province | Area | County-level city | Number of districts | Number of districts selected | Number of schools selected | Boys | Girls | Total |
---|---|---|---|---|---|---|---|---|
Liaoning | Northern China | Beizhen | 17 | 8 | 23 | 712 | 706 | 1,418 |
Guangxi | Southern China | Dahua | 16 | 8 | 9 | 466 | 454 | 920 |
Gansu | Western China | Linxia | 10 | 5 | 10 | 522 | 600 | 1,122 |
Hunan | Central China | Linxiang | 13 | 6 | 6 | 844 | 632 | 1,476 |