| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 230 |
3.5%
|
| 2 | 12 years old | 823 |
12.5%
|
| 3 | 13 years old | 1219 |
18.5%
|
| 4 | 14 years old | 1162 |
17.6%
|
| 5 | 15 years old | 1017 |
15.4%
|
| 6 | 16 years old | 1019 |
15.5%
|
| 7 | 17 years old or older | 1125 |
17.1%
|
| Sysmiss | 65 |