| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 3203 |
75.6%
|
| 2 | SOME DIFFICULTY | 563 |
13.3%
|
| 3 | A LOT OF DIFFICULTY | 39 |
0.9%
|
| 4 | CANNOT SEE AT ALL | 1 |
0%
|
| Sysmiss | 429 |
10.1%
|