| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 3 |
0.6%
|
| 1 | Yes | 71 |
13.8%
|
| 2 | No | 440 |
85.6%
|
| Sysmiss | 300 |