| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very difficult | 531 |
20.2%
|
| 2 | Fairly difficult | 329 |
12.5%
|
| 3 | Fairly easy | 278 |
10.6%
|
| 4 | Very easy | 392 |
14.9%
|
| 5 | I don't know | 1098 |
41.8%
|
| Sysmiss | 135 |