| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 74 |
4.9%
|
| -7 | Does not apply (sponatneous) | 189 |
12.5%
|
| 1 | Yes | 239 |
15.8%
|
| 2 | No | 1010 |
66.8%
|
| Sysmiss | 1443 |