| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Very much difficult | 3 |
6%
|
| 2 | Moderately difficult | 17 |
34%
|
| 3 | Somewhat difficult | 30 |
60%
|
| 4 | Not difficult at all | 0 |
0%
|
| Sysmiss | 113 |