| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.1%
|
| 1 | Very much difficult | 15 |
17.2%
|
| 2 | Moderately difficult | 31 |
35.6%
|
| 3 | Somewhat difficult | 23 |
26.4%
|
| 4 | Not difficult at all | 17 |
19.5%
|
| Sysmiss | 267 |