| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 10 |
15.2%
|
| 1 | Yes | 5 |
7.6%
|
| 2 | No | 51 |
77.3%
|
| Sysmiss | 535 |