| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 37 |
7.4%
|
| 1 | Yes | 337 |
67.7%
|
| 2 | No | 124 |
24.9%
|
| Sysmiss | 103 |