| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 68 |
19.8%
|
| 1 | Yes | 105 |
30.5%
|
| 2 | No | 171 |
49.7%
|
| Sysmiss | 33 |