| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 3676 |
67.1%
|
| 2 | SOME DIFFICULTY | 569 |
10.4%
|
| 3 | A LOT OF DIFFICULTY | 62 |
1.1%
|
| 4 | CANNOT SEE AT ALL | 2 |
0%
|
| Sysmiss | 1167 |
21.3%
|