| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very easy | 820 |
40.5%
|
| 2 | Relatively easy | 799 |
39.5%
|
| 3 | Relatively hard | 314 |
15.5%
|
| 4 | Very hard | 74 |
3.7%
|
| 99 | I'm not sure | 17 |
0.8%
|
| Sysmiss | 1303 |