| Value | Category | Cases | |
|---|---|---|---|
| 1 | Grade R | 23 |
9.4%
|
| 2 | Grade 1 | 45 |
18.4%
|
| 3 | Grade 2 | 76 |
31%
|
| 4 | Grade 3 | 64 |
26.1%
|
| 5 | More than 1 grade | 37 |
15.1%
|
| Sysmiss | 27 |