| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 86 |
19.2%
|
| 1 | Yes | 63 |
14.1%
|
| 2 | No | 299 |
66.7%
|
| Sysmiss | 153 |