| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
2.5%
|
| 1 | Very much difficult | 7 |
17.5%
|
| 2 | Moderately difficult | 11 |
27.5%
|
| 3 | Somewhat difficult | 13 |
32.5%
|
| 4 | Not difficult at all | 8 |
20%
|
| Sysmiss | 323 |