| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Very easy | 111 |
4.7%
|
| 2 | Easy | 667 |
28%
|
| 3 | Difficult | 474 |
19.9%
|
| 4 | Very difficult | 213 |
9%
|
| 7 | Not applicable | 911 |
38.3%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don't know | 2 |
0.1%
|