| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
0.4%
|
| -7 | Does not apply (spontaneous) | 6 |
0.6%
|
| 1 | Yes | 574 |
54.1%
|
| 2 | No | 477 |
45%
|
| Sysmiss | 1008 |