| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 2415 |
86.4%
|
| 2 | SOME DIFFICULTY | 294 |
10.5%
|
| 3 | A LOT OF DIFFICULTY | 18 |
0.6%
|
| 4 | CANNOT SEE AT ALL | 11 |
0.4%
|
| 9 | NO RESPONSE | 1 |
0%
|
| Sysmiss | 55 |
2%
|