| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very difficult. | 1315 |
31.2%
|
| 2 | Fairly difficult. | 767 |
18.2%
|
| 3 | Fairly easy. | 640 |
15.2%
|
| 4 | Very easy | 1493 |
35.4%
|
| Sysmiss | 512 |