| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 15195 |
97.4%
|
| 2 | SOME DIFFICULTY | 286 |
1.8%
|
| 3 | A LOT OF DIFFICULTY | 60 |
0.4%
|
| 4 | CANNOT be understood AT ALL | 51 |
0.3%
|
| 9 | NO RESPONSE | 3 |
0%
|
| Sysmiss | 18 |