| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 2 |
0.2%
|
| 1 | Very easy | 77 |
6.4%
|
| 2 | Easy | 340 |
28.4%
|
| 3 | Difficult | 304 |
25.4%
|
| 4 | Very difficult | 116 |
9.7%
|
| 9 | Don’t know | 359 |
30%
|
| 98 | Refused | 0 |
0%
|