| Value | Category | Cases | |
|---|---|---|---|
| 1 | Impossible | 2007 |
48.4%
|
| 2 | Very difficult | 256 |
6.2%
|
| 3 | Fairly difficult | 119 |
2.9%
|
| 4 | Fairly easy | 100 |
2.4%
|
| 5 | Very easy | 132 |
3.2%
|
| 6 | I do not know | 1534 |
37%
|
| Sysmiss | 151 |