| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Very much difficult | 10 |
17.5%
|
| 2 | Moderately difficult | 22 |
38.6%
|
| 3 | Somewhat difficult | 21 |
36.8%
|
| 4 | Not difficult at all | 4 |
7%
|
| Sysmiss | 417 |