| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very easy | 924 |
45.7%
|
| 2 | Relatively easy | 807 |
39.9%
|
| 3 | Relatively hard | 239 |
11.8%
|
| 4 | Very hard | 45 |
2.2%
|
| 99 | I'm not sure | 9 |
0.4%
|
| Sysmiss | 1303 |