| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
5%
|
| 1 | Very much difficult | 1 |
1%
|
| 2 | Moderately difficult | 19 |
19%
|
| 3 | Somewhat difficult | 10 |
10%
|
| 4 | Not difficult at all | 65 |
65%
|
| Sysmiss | 492 |