| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.8%
|
| 1 | Very much difficult | 17 |
30.9%
|
| 2 | Moderately difficult | 17 |
30.9%
|
| 3 | Somewhat difficult | 9 |
16.4%
|
| 4 | Not difficult at all | 11 |
20%
|
| Sysmiss | 668 |