| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 0 |
0%
|
| -8 | Refused | 0 |
0%
|
| 1 | Yes | 18 |
6.7%
|
| 2 | No | 252 |
93.3%
|
| Sysmiss | 685 |