| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 6 |
15.8%
|
| 1 | Yes | 7 |
18.4%
|
| 2 | No | 25 |
65.8%
|
| Sysmiss | 734 |