| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 34629 |
97.3%
|
| 2 | Some difficulty | 720 |
2%
|
| 3 | A lot of difficulty | 133 |
0.4%
|
| 4 | Cannot be understood at all | 106 |
0.3%
|
| 9 | No response | 9 |
0%
|
| Sysmiss | 1455 |