| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 59 |
3.9%
|
| -7 | Does not apply (sponatneous) | 126 |
8.3%
|
| 1 | Yes | 360 |
23.8%
|
| 2 | No | 967 |
64%
|
| Sysmiss | 1443 |