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Demographic characteristics of participants.
| Characteristic | No. (%) of 2077 Participants |
|---|---|
| Age, mean ± SD, y | 16.27 ± 1.02 |
| Sex | |
| male | 280 (13.5) |
| female | 1797 (86.5) |
| Residential area | |
| rural | 731 (35.2) |
| urban | 1346 (64.8) |
| Perceived family income | |
| low | 212 (10.2) |
| medium | 1842 (88.7) |
| high | 23 (1.1) |
