| Value | Category | Cases | |
|---|---|---|---|
| 1 | 12 years old | 188 |
7.2%
|
| 2 | 13 years old | 486 |
18.5%
|
| 3 | 14 years old | 753 |
28.7%
|
| 4 | 15 years old | 619 |
23.6%
|
| 5 | 16 years old | 367 |
14%
|
| 6 | 17 years old | 136 |
5.2%
|
| 7 | 18 years old | 38 |
1.4%
|
| 8 | 19 years old or older | 34 |
1.3%
|
| Sysmiss | 71 |