| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 4626 |
87.3%
|
| 2 | SOME DIFFICULTY | 299 |
5.6%
|
| 3 | A LOT OF DIFFICULTY | 72 |
1.4%
|
| 4 | CANNOT SEE AT ALL | 3 |
0.1%
|
| Sysmiss | 301 |
5.7%
|