| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 2 |
3.9%
|
| 1 | Yes | 15 |
29.4%
|
| 2 | No | 34 |
66.7%
|
| Sysmiss | 99 |