| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 1375 |
96.8%
|
| 2 | Some difficulty | 38 |
2.7%
|
| 3 | A lot of difficulty | 7 |
0.5%
|
| 4 | Cannot be understood at all | 1 |
0.1%
|
| Sysmiss | 1229 |