| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 3708 |
93.5%
|
| 2 | Some difficulty | 229 |
5.8%
|
| 3 | A lot of difficulty | 29 |
0.7%
|
| 4 | Cannot see at all | 0 |
0%
|
| 9 | No response | 1 |
0%
|
| Sysmiss | 362 |