| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very easy | 816 |
34.3%
|
| 2 | Relatively easy | 1112 |
46.7%
|
| 3 | Relatively hard | 339 |
14.2%
|
| 4 | Very hard | 90 |
3.8%
|
| 99 | I'm not sure | 23 |
1%
|
| Sysmiss | 947 |