| Characteristics | Percentage | 95% CI | |
|---|---|---|---|
| Gender | Male | 45.5 | 40.0 - 51.2 |
| Female | 54.5 | 48.8 - 60.0 | |
| Age | 12 | 24.2 | 23.5 - 24.9 |
| 13 | 27.4 | 26.7 - 28.2 | |
| 14 | 24.1 | 23.7 - 24.6 | |
| 15 | 24.2 | 23.8 - 24.6 | |
| Academic performance | Very good | 52.0 | 10.9 - 90.5 |
| Good | 33.6 | 10.0 - 697 | |
| Average - Below average | 14.4 | 2.7 - 50.7 | |
| Conduct | Very good | 89.7 | 67.7 - 97.3 |
| Good | 8.6 | 2.4 - 26.6 | |
| Average | 1.7 | 0.0 - 8.9 |