| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 1 |
1.2%
|
| 1 | Yes | 77 |
89.5%
|
| 2 | No | 8 |
9.3%
|
| Sysmiss | 274 |