| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 23 |
8.7%
|
| 1 | Yes | 50 |
18.9%
|
| 2 | No | 192 |
72.5%
|
| Sysmiss | 94 |