| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 74 |
1.3%
|
| 2 | 12 years old | 596 |
10.5%
|
| 3 | 13 years old | 873 |
15.3%
|
| 4 | 14 years old | 953 |
16.7%
|
| 5 | 15 years old | 925 |
16.3%
|
| 6 | 16 years old | 958 |
16.8%
|
| 7 | 17 years old | 874 |
15.4%
|
| 8 | 18 years old or older | 439 |
7.7%
|
| Sysmiss | 16 |