| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very difficult | 243 |
11.4%
|
| 2 | Fairly difficult | 97 |
4.5%
|
| 3 | Fairly easy | 189 |
8.9%
|
| 4 | Very easy | 227 |
10.6%
|
| 5 | I don't know | 1377 |
64.6%
|
| Sysmiss | 135 |