| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.5%
|
| 1 | Very much difficult | 8 |
4.1%
|
| 2 | Moderately difficult | 91 |
46.9%
|
| 3 | Somewhat difficult | 58 |
29.9%
|
| 4 | Not difficult at all | 36 |
18.6%
|
| Sysmiss | 1022 |