| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 74 |
4.9%
|
| -7 | Does not apply (sponatneous) | 203 |
13.4%
|
| 1 | Yes | 289 |
19.1%
|
| 2 | No | 946 |
62.6%
|
| Sysmiss | 1443 |