| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 62 |
4.1%
|
| -7 | Does not apply (sponatneous) | 122 |
8.1%
|
| 1 | Yes | 416 |
27.5%
|
| 2 | No | 912 |
60.3%
|
| Sysmiss | 1443 |