| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 25 |
1.2%
|
| 2 | 12 years old | 342 |
16.7%
|
| 3 | 13 years old | 439 |
21.4%
|
| 4 | 14 years old | 395 |
19.2%
|
| 5 | 15 years old | 276 |
13.4%
|
| 6 | 16 years old | 281 |
13.7%
|
| 7 | 17 years old | 227 |
11.1%
|
| 8 | 18 years old or older | 69 |
3.4%
|
| Sysmiss | 3 |