| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 24 |
1.5%
|
| 2 | 12 years old | 133 |
8.2%
|
| 3 | 13 years old | 412 |
25.4%
|
| 4 | 14 years old | 447 |
27.6%
|
| 5 | 15 years old | 427 |
26.4%
|
| 6 | 16 years old | 139 |
8.6%
|
| 7 | 17 years old | 37 |
2.3%
|
| Sysmiss | 26 |