| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 2120 |
61%
|
| 2 | SOME DIFFICULTY | 45 |
1.3%
|
| 3 | A LOT OF DIFFICULTY | 4 |
0.1%
|
| 4 | CANNOT SEE AT ALL | 5 |
0.1%
|
| 9 | NO RESPONSE | 3 |
0.1%
|
| Sysmiss | 1297 |
37.3%
|