| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very simple | 4 |
1.1%
|
| 2 | Simple | 29 |
7.7%
|
| 3 | OK | 160 |
42.3%
|
| 4 | Difficult | 156 |
41.3%
|
| 5 | Very difficult | 29 |
7.7%
|
| Sysmiss | 642 |