| Academic Level | Total | Boys | Girls | ||
| % | % | Age (SD) | % | Age (SD) | |
| 7th Grade | 7.5 | 60.2 | 12.28 (0.53) | 39.8 | 12.19 (0.44) |
| 8th Grade | 14.1 | 47.2 | 13.42 (0.63) | 52.8 | 13.45 (0.67) |
| 9th Grade | 1.7 | 33.3 | 14.60 (0.70) | 66.7 | 14.75 (1.02) |
| 10th Grade | 43.6 | 46.2 | 15.50 (0.65) | 53.8 | 15.42 (0.63) |
| 11th Grade | 28.6 | 46.1 | 16.36 (0.68) | 53.9 | 16.27 (1.10) |
| 12th Grade | 4.5 | 63.8 | 16.96 (0.20) | 36.3 | 19.97 (0.19) |