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Demographic characteristics of participants (N = 1,654).
| Category | Group | n | % |
|---|---|---|---|
| Region | Pearl River Delta | 573 | 34.64 |
| Eastern Guangdong | 434 | 26.24 | |
| Western Guangdong | 432 | 26.12 | |
| Northern Guangdong | 215 | 13.00 | |
| Teaching stage | Primary school | 725 | 43.83 |
| Secondary school | 929 | 56.17 | |
| School location | Urban area | 795 | 48.07 |
| County/town area | 532 | 32.16 | |
| Rural area | 327 | 19.77 |
