| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 5273 |
96.2%
|
| 2 | SOME DIFFICULTY | 65 |
1.2%
|
| 3 | A LOT OF DIFFICULTY | 13 |
0.2%
|
| 4 | CANNOT SEE AT ALL | 7 |
0.1%
|
| 9 | NO RESPONSE | 1 |
0%
|
| Sysmiss | 120 |
2.2%
|