| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 56 |
3.1%
|
| 2 | 12 years old | 397 |
21.7%
|
| 3 | 13 years old | 521 |
28.4%
|
| 4 | 14 years old | 486 |
26.5%
|
| 5 | 15 years old | 255 |
13.9%
|
| 6 | 16 years old | 77 |
4.2%
|
| 7 | 17 years old or older | 40 |
2.2%
|
| Sysmiss | 56 |