| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 2783 |
54.5%
|
| 2 | Minor difficulty | 89 |
1.7%
|
| 3 | Great difficulty | 109 |
2.1%
|
| 8 | 8. Not applicable | 2118 |
41.5%
|
| 9 | I do not know | 4 |
0.1%
|
| Sysmiss | 2 |