| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 2 |
4.9%
|
| 1 | Yes | 22 |
53.7%
|
| 2 | No | 17 |
41.5%
|
| Sysmiss | 318 |