| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very easy | 453 |
22.4%
|
| 2 | Relatively easy | 763 |
37.7%
|
| 3 | Relatively hard | 586 |
29%
|
| 4 | Very hard | 194 |
9.6%
|
| 99 | I'm not sure | 28 |
1.4%
|
| Sysmiss | 1303 |