| Value | Category | Cases | |
|---|---|---|---|
| 1 | First grade | 450 |
24.6%
|
| 2 | Second grade | 597 |
32.7%
|
| 3 | Third grade | 434 |
23.7%
|
| 4 | Fourth grade | 347 |
19%
|
| Sysmiss | 10 |