| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
0.7%
|
| -7 | Does not apply (spontaneous) | 4 |
0.7%
|
| 1 | Yes | 275 |
50.6%
|
| 2 | No | 261 |
48%
|
| Sysmiss | 454 |