| Value | Category | Cases | |
|---|---|---|---|
| 0 | not difficult at all | 456 |
14.9%
|
| 1 | somewhat difficult | 1114 |
36.5%
|
| 2 | very difficult | 443 |
14.5%
|
| 3 | extremely difficult | 94 |
3.1%
|
| Missing value | 948 |
31%
|