| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 74 |
3.6%
|
| 2 | 12 years old | 158 |
7.8%
|
| 3 | 13 years old | 364 |
17.9%
|
| 4 | 14 years old | 460 |
22.6%
|
| 5 | 15 years old | 513 |
25.2%
|
| 6 | 16 years old | 320 |
15.7%
|
| 7 | 17 years old or older | 143 |
7%
|
| Sysmiss | 51 |