| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 4 |
7.8%
|
| 1 | Yes | 27 |
52.9%
|
| 2 | No | 20 |
39.2%
|
| Sysmiss | 99 |