| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 1 |
0.1%
|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Yes | 597 |
52.1%
|
| 2 | No | 547 |
47.8%
|
| Sysmiss | 178 |