| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 82 |
5.4%
|
| -7 | Does not apply (sponatneous) | 200 |
13.2%
|
| 1 | Yes | 252 |
16.7%
|
| 2 | No | 978 |
64.7%
|
| Sysmiss | 1443 |