| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 1 |
1.4%
|
| -9 | Don't know (spontaneous) | 2 |
2.8%
|
| 1 | Yes | 31 |
43.7%
|
| 2 | No | 37 |
52.1%
|
| Sysmiss | 530 |