| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 24 |
1.1%
|
| 2 | 12 years old | 281 |
13.2%
|
| 3 | 13 years old | 582 |
27.4%
|
| 4 | 14 years old | 569 |
26.8%
|
| 5 | 15 years old | 428 |
20.1%
|
| 6 | 16 years old | 220 |
10.3%
|
| 7 | 17 years old or older | 23 |
1.1%
|
| Sysmiss | 5 |