| Value | Category | Cases | |
|---|---|---|---|
| 1 | 12 years old | 92 |
4.3%
|
| 2 | 13 years old | 402 |
18.9%
|
| 3 | 14 years old | 541 |
25.4%
|
| 4 | 15 years old | 569 |
26.7%
|
| 5 | 16 years old | 279 |
13.1%
|
| 6 | 17 years old | 153 |
7.2%
|
| 7 | 18 years old | 50 |
2.3%
|
| 8 | 19 years old or older | 43 |
2%
|
| Sysmiss | 7 |