| Value | Category | Cases | |
|---|---|---|---|
| 0 | 1465 |
69.8%
|
|
| 1 | very easy | 28 |
1.3%
|
| 2 | easy | 102 |
4.9%
|
| 3 | uncertain | 145 |
6.9%
|
| 4 | difficult | 213 |
10.1%
|
| 5 | very difficult | 146 |
7%
|