| Value | Category | Cases | |
|---|---|---|---|
| 1 | 12 years old | 206 |
10.7%
|
| 2 | 13 years old | 322 |
16.7%
|
| 3 | 14 years old | 451 |
23.4%
|
| 4 | 15 years old | 415 |
21.5%
|
| 5 | 16 years old | 317 |
16.4%
|
| 6 | 17 years old | 168 |
8.7%
|
| 7 | 18 years old | 45 |
2.3%
|
| 8 | 19 years old or older | 7 |
0.4%
|
| Sysmiss | 88 |