| Value | Category | Cases | |
|---|---|---|---|
| 1 | 12 years old | 36 |
3.1%
|
| 2 | 13 years old | 171 |
14.6%
|
| 3 | 14 years old | 243 |
20.7%
|
| 4 | 15 years old | 241 |
20.6%
|
| 5 | 16 years old | 184 |
15.7%
|
| 6 | 17 years old | 150 |
12.8%
|
| 7 | 18 years old | 82 |
7%
|
| 8 | 19 years old or older | 65 |
5.5%
|
| Sysmiss | 26 |