| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1st grade | 8 |
4.8%
|
| 2 | 2nd grade | 19 |
11.3%
|
| 3 | 3rd grade | 20 |
11.9%
|
| 4 | 4th grade | 15 |
8.9%
|
| 5 | 5th grade | 106 |
63.1%
|
| Sysmiss | 488 |