| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
0.8%
|
| -7 | Does not apply (spontaneous) | 26 |
2.1%
|
| 1 | Yes | 582 |
47.2%
|
| 2 | No | 616 |
49.9%
|
| Sysmiss | 5 |