| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 2 |
0.1%
|
| 1 | Very easy | 341 |
14.3%
|
| 2 | Easy | 875 |
36.6%
|
| 3 | Difficult | 497 |
20.8%
|
| 4 | Very difficult | 241 |
10.1%
|
| 9 | Don't Know | 431 |
18%
|
| 98 | Refused | 3 |
0.1%
|