| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 9 |
1.2%
|
| 2 | 12 years old | 20 |
2.6%
|
| 3 | 13 years old | 172 |
22.5%
|
| 4 | 14 years old | 225 |
29.4%
|
| 5 | 15 years old | 249 |
32.5%
|
| 6 | 16 years old | 64 |
8.4%
|
| 7 | 17 years old or older | 27 |
3.5%
|
| Sysmiss | 3 |