| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 1 |
0.4%
|
| -9 | Don't know (spontaneous) | 5 |
1.8%
|
| 1 | Yes | 144 |
50.7%
|
| 2 | No | 134 |
47.2%
|
| Sysmiss | 76 |