| Value | Category | Cases | |
|---|---|---|---|
| 1 | 12 years old | 91 |
6.9%
|
| 2 | 13 years old | 336 |
25.6%
|
| 3 | 14 years old | 336 |
25.6%
|
| 4 | 15 years old | 263 |
20%
|
| 5 | 16 years old | 155 |
11.8%
|
| 6 | 17 years old | 79 |
6%
|
| 7 | 18 years old | 39 |
3%
|
| 8 | 19 years old or older | 14 |
1.1%
|
| Sysmiss | 1 |