| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 24 |
0.7%
|
| 2 | 12 years old | 253 |
7.8%
|
| 3 | 13 years old | 557 |
17.2%
|
| 4 | 14 years old | 697 |
21.5%
|
| 5 | 15 years old | 623 |
19.2%
|
| 6 | 16 years old | 494 |
15.2%
|
| 7 | 17 years old | 414 |
12.8%
|
| 8 | 18 years old or older | 178 |
5.5%
|
| Sysmiss | 7 |