| Value | Category | Cases | |
|---|---|---|---|
| 1 | 12 years old | 22 |
2.3%
|
| 2 | 13 years old | 113 |
11.7%
|
| 3 | 14 years old | 263 |
27.1%
|
| 4 | 15 years old | 294 |
30.3%
|
| 5 | 16 years old | 181 |
18.7%
|
| 6 | 17 years old | 75 |
7.7%
|
| 7 | 18 years old | 14 |
1.4%
|
| 8 | 19 years old or older | 7 |
0.7%
|
| Sysmiss | 2 |