| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 144 |
6.9%
|
| 2 | 12 years old | 160 |
7.6%
|
| 3 | 13 years old | 256 |
12.2%
|
| 4 | 14 years old | 400 |
19%
|
| 5 | 15 years old | 423 |
20.1%
|
| 6 | 16 years old | 413 |
19.6%
|
| 7 | 17 years old or older | 306 |
14.6%
|
| Sysmiss | 54 |