| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.7%
|
| -7 | Does not apply (spontaneous) | 14 |
3.5%
|
| 1 | Yes | 107 |
26.7%
|
| 2 | No | 277 |
69.1%
|
| Sysmiss | 8 |