| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 321 |
12.1%
|
| 2 | 12 years old | 569 |
21.5%
|
| 3 | 13 years old | 641 |
24.2%
|
| 4 | 14 years old | 571 |
21.6%
|
| 5 | 15 years old | 353 |
13.3%
|
| 6 | 16 years old | 138 |
5.2%
|
| 7 | 17 years old or older | 54 |
2%
|
| Sysmiss | 95 |