| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 4837 |
97.1%
|
| 2 | SOME DIFFICULTY | 79 |
1.6%
|
| 3 | A LOT OF DIFFICULTY | 15 |
0.3%
|
| 4 | CANNOT SEE AT ALL | 3 |
0.1%
|
| Sysmiss | 49 |
1%
|