| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 405 |
10.9%
|
| 2 | 12 years old | 672 |
18.1%
|
| 3 | 13 years old | 870 |
23.4%
|
| 4 | 14 years old | 739 |
19.9%
|
| 5 | 15 years old | 431 |
11.6%
|
| 6 | 16 years old | 344 |
9.3%
|
| 7 | 17 years old or older | 253 |
6.8%
|
| Sysmiss | 57 |