| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 123 |
27.5%
|
| 1 | Yes | 85 |
19%
|
| 2 | No | 240 |
53.6%
|
| Sysmiss | 153 |