| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 300 |
3%
|
| 2 | 12 years old | 1365 |
13.7%
|
| 3 | 13 years old | 1732 |
17.4%
|
| 4 | 14 years old | 1788 |
17.9%
|
| 5 | 15 years old | 1605 |
16.1%
|
| 6 | 16 years old | 1553 |
15.6%
|
| 7 | 17 years old or older | 1635 |
16.4%
|
| Sysmiss | 14 |