| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 3 |
1.2%
|
| 1 | Yes | 55 |
22.6%
|
| 2 | No | 185 |
76.1%
|
| Sysmiss | 853 |