| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 79 |
5.2%
|
| -7 | Does not apply (sponatneous) | 227 |
15%
|
| 1 | Yes | 222 |
14.7%
|
| 2 | No | 984 |
65.1%
|
| Sysmiss | 1443 |