| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 57 |
3.1%
|
| 2 | 12 years old | 195 |
10.8%
|
| 3 | 13 years old | 506 |
27.9%
|
| 4 | 14 years old | 503 |
27.7%
|
| 5 | 15 years old | 343 |
18.9%
|
| 6 | 16 years old | 141 |
7.8%
|
| 7 | 17 years old or older | 68 |
3.8%
|
| Sysmiss | 7 |