| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 9 |
0.4%
|
| 2 | 12 years old | 22 |
1%
|
| 3 | 13 years old | 226 |
10.1%
|
| 4 | 14 years old | 351 |
15.6%
|
| 5 | 15 years old | 490 |
21.8%
|
| 6 | 16 years old | 552 |
24.6%
|
| 7 | 17 years old | 404 |
18%
|
| 8 | 18 years old or older | 191 |
8.5%
|
| Sysmiss | 12 |