| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 218 |
11.4%
|
| 2 | 12 years old | 391 |
20.5%
|
| 3 | 13 years old | 510 |
26.7%
|
| 4 | 14 years old | 424 |
22.2%
|
| 5 | 15 years old | 217 |
11.4%
|
| 6 | 16 years old | 121 |
6.3%
|
| 7 | 17 years old or older | 26 |
1.4%
|
| Sysmiss | 4 |