| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very easy | 455 |
19.1%
|
| 2 | Relatively easy | 762 |
32%
|
| 3 | Relatively hard | 791 |
33.2%
|
| 4 | Very hard | 295 |
12.4%
|
| 99 | I'm not sure | 77 |
3.2%
|
| Sysmiss | 947 |