| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 28 |
1.1%
|
| 2 | 12 years old | 90 |
3.5%
|
| 3 | 13 years old | 354 |
13.9%
|
| 4 | 14 years old | 537 |
21.1%
|
| 5 | 15 years old | 512 |
20.1%
|
| 6 | 16 years old | 469 |
18.5%
|
| 7 | 17 years old | 269 |
10.6%
|
| 8 | 18 years old or older | 283 |
11.1%
|
| Sysmiss | 37 |