| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 5 |
14.7%
|
| 1 | Yes | 7 |
20.6%
|
| 2 | No | 22 |
64.7%
|
| Sysmiss | 726 |