| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 22114 |
92.7%
|
| 2 | Some difficulty | 1559 |
6.5%
|
| 3 | A lot of difficulty | 118 |
0.5%
|
| 4 | Cannot understand at all | 50 |
0.2%
|
| 9 | No response | 2 |
0%
|
| Sysmiss | 18565 |