| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 704 |
47.6%
|
| 2 | SOME DIFFICULTY | 51 |
3.4%
|
| 3 | A LOT OF DIFFICULTY | 1 |
0.1%
|
| 4 | CANNOT SEE AT ALL | 1 |
0.1%
|
| Sysmiss | 722 |
48.8%
|