| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 44 |
0.5%
|
| -7 | Not applicable (spontaneous) | 84 |
0.9%
|
| 1 | Yes | 4450 |
48.5%
|
| 2 | No | 4590 |
50.1%
|
| Sysmiss | 1504 |