| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 40 |
2.4%
|
| 2 | 12 years old | 167 |
10.2%
|
| 3 | 13 years old | 274 |
16.7%
|
| 4 | 14 years old | 351 |
21.5%
|
| 5 | 15 years old | 318 |
19.4%
|
| 6 | 16 years old | 195 |
11.9%
|
| 7 | 17 years old | 171 |
10.5%
|
| 8 | 18 years old or older | 120 |
7.3%
|
| Sysmiss | 12 |