| Value | Category | Cases | |
|---|---|---|---|
| 0 | 1465 |
69.8%
|
|
| 1 | very easy | 29 |
1.4%
|
| 2 | easy | 76 |
3.6%
|
| 3 | uncertain | 122 |
5.8%
|
| 4 | difficult | 241 |
11.5%
|
| 5 | very difficult | 166 |
7.9%
|