| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Very much difficult | 1 |
4%
|
| 2 | Moderately difficult | 5 |
20%
|
| 3 | Somewhat difficult | 8 |
32%
|
| 4 | Not difficult at all | 11 |
44%
|
| Sysmiss | 132 |