| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 144 |
3.8%
|
| 2 | 12 years old | 553 |
14.4%
|
| 3 | 13 years old | 972 |
25.4%
|
| 4 | 14 years old | 922 |
24.1%
|
| 5 | 15 years old | 633 |
16.5%
|
| 6 | 16 years old | 512 |
13.4%
|
| 7 | 17 years old or older | 95 |
2.5%
|
| Sysmiss | 9 |