| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 5055 |
92.3%
|
| 2 | SOME DIFFICULTY | 216 |
3.9%
|
| 3 | A LOT OF DIFFICULTY | 27 |
0.5%
|
| 4 | CANNOT SEE AT ALL | 6 |
0.1%
|
| 9 | NO RESPONSE | 2 |
0%
|
| Sysmiss | 173 |
3.2%
|