| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 35 |
2.5%
|
| -7 | Does not apply (spontaneous) | 55 |
3.9%
|
| 1 | Yes | 445 |
31.5%
|
| 2 | No | 878 |
62.1%
|
| Sysmiss | 33 |