| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 2 |
6.7%
|
| 1 | Yes | 6 |
20%
|
| 2 | No | 22 |
73.3%
|
| Sysmiss | 571 |