| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 2068 |
46.6%
|
| 2 | SOME DIFFICULTY | 339 |
7.6%
|
| 3 | A LOT OF DIFFICULTY | 66 |
1.5%
|
| 4 | CANNOT SEE AT ALL | 2 |
0%
|
| 9 | NO RESPONSE | 1 |
0%
|
| Sysmiss | 1962 |
44.2%
|