| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 1 |
0.2%
|
| 1 | Yes | 76 |
18.1%
|
| 2 | No | 342 |
81.6%
|
| Sysmiss | 341 |