| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 58 |
3.4%
|
| 2 | 12 years old | 305 |
18.1%
|
| 3 | 13 years old | 490 |
29.1%
|
| 4 | 14 years old | 510 |
30.3%
|
| 5 | 15 years old | 264 |
15.7%
|
| 6 | 16 years old | 42 |
2.5%
|
| 7 | 17 years old or older | 13 |
0.8%
|
| Sysmiss | 1 |