| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Very easy | 75 |
3.1%
|
| 2 | Easy | 284 |
11.8%
|
| 3 | Difficult | 834 |
34.8%
|
| 4 | Very difficult | 851 |
35.5%
|
| 8 | Refused | 2 |
0.1%
|
| 9 | Don’t know | 354 |
14.8%
|