| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 103 |
6.8%
|
| -7 | Does not apply (sponatneous) | 231 |
15.3%
|
| 1 | Yes | 148 |
9.8%
|
| 2 | No | 1030 |
68.1%
|
| Sysmiss | 1443 |