| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very easy | 89 |
4%
|
| 2 | Easy | 198 |
9%
|
| 3 | Difficult | 615 |
28%
|
| 4 | Very difficult | 1001 |
45.5%
|
| 9 | Don't know | 294 |
13.4%
|
| 97 | Not applicable | 1 |
0%
|