| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 2012 |
57.9%
|
| 2 | SOME DIFFICULTY | 142 |
4.1%
|
| 3 | A LOT OF DIFFICULTY | 11 |
0.3%
|
| 4 | CANNOT SEE AT ALL | 8 |
0.2%
|
| 9 | NO RESPONSE | 4 |
0.1%
|
| Sysmiss | 1297 |
37.3%
|