| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very easy | 974 |
40.9%
|
| 2 | Relatively easy | 1102 |
46.3%
|
| 3 | Relatively hard | 265 |
11.1%
|
| 4 | Very hard | 15 |
0.6%
|
| 99 | I'm not sure | 24 |
1%
|
| Sysmiss | 947 |