| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 46 |
1.4%
|
| 2 | 12 years old | 323 |
9.5%
|
| 3 | 13 years old | 603 |
17.8%
|
| 4 | 14 years old | 639 |
18.9%
|
| 5 | 15 years old | 595 |
17.6%
|
| 6 | 16 years old | 536 |
15.8%
|
| 7 | 17 years old | 314 |
9.3%
|
| 8 | 18 years old or older | 332 |
9.8%
|
| Sysmiss | 64 |