| Value | Category | Cases | |
|---|---|---|---|
| -9 | DON’T KNOW (SPONTANEOUS) | 3 |
0.8%
|
| -7 | DOES NOT APPLY (SPONTANEOUS) | 18 |
4.5%
|
| 0 | Very easy | 67 |
16.8%
|
| 1 | Easy | 202 |
50.5%
|
| 2 | Difficult | 106 |
26.5%
|
| 3 | Very dificult | 4 |
1%
|
| Sysmiss | 1173 |