| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Very much difficult | 20 |
40%
|
| 2 | Moderately difficult | 4 |
8%
|
| 3 | Somewhat difficult | 18 |
36%
|
| 4 | Not difficult at all | 8 |
16%
|
| Sysmiss | 98 |