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Demographic characteristics of the students (N = 218).
| Item | Total | Seventh grade | Eighth grade | Ninth grade | P value |
|---|---|---|---|---|---|
| Number, n | 218 | 77 | 64 | 77 | |
| Sex (male), n (%) | 108 (49.5) | 42 (54.5) | 31 (48.4) | 35 (45.4) | 0.52 |
| Total CASC-P score | 11.3 ± 6.9 | 11.1 ± 6.9 | 11.8 ± 7.2 | 11.2 ± 6.6 | 0.89 |
| Total ≥18, n (%) | 34 (15.6) | 11 (14.3) | 9 (14.1) | 14 (18.2) | 0.74 |
