| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 9 |
30%
|
| 1 | Yes | 5 |
16.7%
|
| 2 | No | 16 |
53.3%
|
| Sysmiss | 1339 |