| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 4 |
11.8%
|
| 1 | Yes | 9 |
26.5%
|
| 2 | No | 21 |
61.8%
|
| Sysmiss | 726 |