| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Very easy | 72 |
3%
|
| 2 | Easy | 322 |
13.4%
|
| 3 | Difficult | 423 |
17.6%
|
| 4 | Very difficult | 438 |
18.3%
|
| 7 | Not applicable | 1144 |
47.7%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don't know | 1 |
0%
|