| Value | Category | Cases | |
|---|---|---|---|
| 1 | Bad sighted | 122 |
31.6%
|
| 2 | Blind | 28 |
7.3%
|
| 3 | No | 234 |
60.6%
|
| 7 | Missing | 2 |
0.5%
|
| 9 | DK | 0 |
0%
|
| Sysmiss | 29562 |