| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 2668 |
95.5%
|
| 2 | SOME DIFFICULTY | 58 |
2.1%
|
| 3 | A LOT OF DIFFICULTY | 8 |
0.3%
|
| 4 | CANNOT SEE AT ALL | 5 |
0.2%
|
| Sysmiss | 55 |
2%
|