| Value | Category | Cases | |
|---|---|---|---|
| 1 | 6th grade | 571 |
20%
|
| 2 | 7th grade | 860 |
30.2%
|
| 3 | 8th grade | 732 |
25.7%
|
| 4 | 9th grade | 688 |
24.1%
|
| Sysmiss | 12 |