| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 4 |
1.9%
|
| 1 | Yes | 44 |
21.4%
|
| 2 | No | 158 |
76.7%
|
| Sysmiss | 495 |