| Value | Category | Cases | |
|---|---|---|---|
| 0 | easy | 477 |
9.7%
|
| 1 | moderate | 499 |
10.1%
|
| 2 | difficult | 3223 |
65.2%
|
| 3 | not applicable | 744 |
15.1%
|
| Sysmiss | 15 |