| Age (years) | Frequency (%) | ||
|---|---|---|---|
| Male | Female | Total | |
| 12 | 42 (14.0) | 51 (16.3) | 93 (15.2) |
| 13 | 44 (14.7) | 36 (11.5) | 80 (13.1) |
| 14 | 50 (16.7) | 43 (13.7) | 93 (15.2) |
| 15 | 42 (14.0) | 33 (10.5) | 75 (12.3) |
| 16 | 44 (14.7) | 55 (17.6) | 99 (16.2) |
| 17 | 43 (14.4) | 65 (20.8) | 108 (17.6) |
| 18 | 34 (11.4) | 30 (9.6) | 64 (10.5) |
| Total | 299 (48.9) | 313 (51.1) | 612 (100) |
| Mean | 14.9 ± 1.9 | 15.0 ± 2.0 | 15.0 ± 2.0 |
| Median | 15 | 15 | 15 |