| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 29 |
1.3%
|
| 2 | 12 years old | 171 |
7.8%
|
| 3 | 13 years old | 415 |
18.9%
|
| 4 | 14 years old | 479 |
21.8%
|
| 5 | 15 years old | 498 |
22.7%
|
| 6 | 16 years old | 390 |
17.8%
|
| 7 | 17 years old | 183 |
8.3%
|
| 8 | 18 years old or older | 29 |
1.3%
|
| Sysmiss | 6 |