| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 1 |
0.1%
|
| -88 | Refused | 3 |
0.4%
|
| 0 | No | 540 |
79.1%
|
| 1 | Yes | 139 |
20.4%
|
| Missing value | 535 |