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Demographic characteristics of participants
| Demographic characteristic | n (%) |
|---|---|
| Sex | |
| Male | 22 (54) |
| Female | 19 (46) |
| Age | |
| 11–13 | 6 (15) |
| 14–16 | 11 (27) |
| 17–19 | 24 (58) |
| Grade | |
| Secondary school | 14 (34) |
| High school | 18 (44) |
| University | 5 (12) |
| Others | 4 (10) |
| Total | 41 (100) |
