| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 20 |
6.5%
|
| 1 | Very much difficult | 14 |
4.6%
|
| 2 | Moderately difficult | 60 |
19.6%
|
| 3 | Somewhat difficult | 108 |
35.3%
|
| 4 | Not difficult at all | 104 |
34%
|
| Sysmiss | 1883 |