| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
7.6%
|
| 1 | Very much difficult | 15 |
22.7%
|
| 2 | Moderately difficult | 21 |
31.8%
|
| 3 | Somewhat difficult | 15 |
22.7%
|
| 4 | Not difficult at all | 10 |
15.2%
|
| Sysmiss | 292 |