| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 13 |
1.5%
|
| 2 | 12 years old | 20 |
2.2%
|
| 3 | 13 years old | 166 |
18.6%
|
| 4 | 14 years old | 238 |
26.7%
|
| 5 | 15 years old | 217 |
24.4%
|
| 6 | 16 years old | 188 |
21.1%
|
| 7 | 17 years old or older | 49 |
5.5%
|
| Sysmiss | 5 |