| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 2 |
2%
|
| 1 | Yes | 64 |
63.4%
|
| 2 | No | 35 |
34.7%
|
| Sysmiss | 124 |