| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 108 |
7.1%
|
| -7 | Does not apply (sponatneous) | 230 |
15.2%
|
| 1 | Yes | 134 |
8.9%
|
| 2 | No | 1040 |
68.8%
|
| Sysmiss | 1443 |