| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
2.5%
|
| 1 | Very much difficult | 25 |
62.5%
|
| 2 | Moderately difficult | 6 |
15%
|
| 3 | Somewhat difficult | 7 |
17.5%
|
| 4 | Not difficult at all | 1 |
2.5%
|
| Sysmiss | 471 |