| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 868 |
29.4%
|
| 1 | Very much difficult | 266 |
9%
|
| 2 | Moderately difficult | 860 |
29.1%
|
| 3 | Somewhat difficult | 523 |
17.7%
|
| 4 | Not difficult at all | 438 |
14.8%
|