| Value | Category | Cases | |
|---|---|---|---|
| 1 | VERY EASY | 547 |
6.4%
|
| 2 | QUITE EASY | 969 |
11.3%
|
| 3 | UNSURE | 1884 |
21.9%
|
| 4 | A LITTLE BIT DIFFICULT | 2816 |
32.7%
|
| 5 | VERY DIFFICULT | 2383 |
27.7%
|
| Sysmiss | 753 |