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Demographic characteristics (N = 25,987).
| Variable | Number (%) | |
|---|---|---|
| Sex | Male | 13,523 (52.0) |
| Female | 12,464 (48.0) | |
| Grade | 10 | 8907 (34.3) |
| 11 | 8907 (34.3) | |
| 12 | 8173 (31.5) | |
| School type | General high school | 20,616 (79.3) |
| Specialized high school | 4976 (19.1) | |
| Others | 395 (1.5) | |
| City type | Metropolitan | 11,374 (43.8) |
| Mid-sized cities | 12,838 (47.7) | |
| Rural | 2230 (8.6) |
