| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 57 |
3.4%
|
| 2 | 12 years old | 238 |
14.3%
|
| 3 | 13 years old | 345 |
20.7%
|
| 4 | 14 years old | 368 |
22.1%
|
| 5 | 15 years old | 306 |
18.4%
|
| 6 | 16 years old | 225 |
13.5%
|
| 7 | 17 years old or older | 126 |
7.6%
|
| Sysmiss | 6 |