| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 36 |
4.4%
|
| 1 | Yes | 330 |
40.6%
|
| 2 | No | 447 |
55%
|
| Sysmiss | 147 |