| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very difficult | 395 |
8.6%
|
| 2 | Fairly difficult | 196 |
4.3%
|
| 3 | Fairly easy | 484 |
10.5%
|
| 4 | Very easy | 1116 |
24.2%
|
| 5 | I don't know | 2414 |
52.4%
|
| Sysmiss | 67 |