| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 5205 |
90.3%
|
| 2 | SOME DIFFICULTY | 62 |
1.1%
|
| 3 | A LOT OF DIFFICULTY | 2 |
0%
|
| 4 | CANNOT SEE AT ALL | 1 |
0%
|
| Sysmiss | 495 |
8.6%
|