| Value | Category | Cases | |
|---|---|---|---|
| 1 | 6th grade | 482 |
27.7%
|
| 2 | 7th grade | 600 |
34.4%
|
| 3 | 8th grade | 382 |
21.9%
|
| 4 | 9th grade | 279 |
16%
|
| Sysmiss | 29 |