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Demographic characteristics of the samples.
| Variables | Cases (n) | Frequency (%) |
|---|---|---|
| Sex | ||
| Female | 311 | 48.10 |
| Male | 335 | 51.90 |
| Grade | ||
| 7 | 213 | 33.00 |
| 8 | 231 | 35.80 |
| 9 | 202 | 31.30 |
| Only Child (dushengzinv) | ||
| No | 481 | 74.50 |
| Yes | 165 | 25.50 |
| Living in School | ||
| No | 253 | 39.20 |
| Yes | 393 | 60.80 |
| Region | ||
| Ningqiang county | 197 | 30.50 |
| Chenggu county | 146 | 22.60 |
| Ye county | 303 | 46.90 |
