| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 3480 |
68.2%
|
| 2 | Minor difficulty | 387 |
7.6%
|
| 3 | Great difficulty | 271 |
5.3%
|
| 8 | 8. Not applicable | 962 |
18.8%
|
| 9 | I do not know | 3 |
0.1%
|
| Sysmiss | 2 |