| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 401 |
80.5%
|
| -9 | Don't know (spontaneous) | 8 |
1.6%
|
| 1 | Yes | 30 |
6%
|
| 2 | No | 59 |
11.8%
|
| Sysmiss | 103 |