| Value | Category | Cases | |
|---|---|---|---|
| 1 | 12 years old | 160 |
5.3%
|
| 2 | 13 years old | 740 |
24.7%
|
| 3 | 14 years old | 887 |
29.6%
|
| 4 | 15 years old | 806 |
26.9%
|
| 5 | 16 years old | 277 |
9.2%
|
| 6 | 17 years old | 96 |
3.2%
|
| 7 | 18 years old | 23 |
0.8%
|
| 8 | 19 years old or older | 12 |
0.4%
|
| Sysmiss | 6 |