| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 |
0.9%
|
| -7 | Does not apply (spontaneous) | 26 |
1.9%
|
| 1 | Yes | 404 |
30.3%
|
| 2 | No | 893 |
66.9%
|
| Sysmiss | 2 |