| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 7384 |
62.9%
|
| 2 | SOME DIFFICULTY | 2115 |
18%
|
| 3 | A LOT OF DIFFICULTY | 375 |
3.2%
|
| 4 | CANNOT SEE AT ALL | 2 |
0%
|
| 9 | NO RESPONSE | 3 |
0%
|
| Sysmiss | 1858 |
15.8%
|