| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 25 |
6.3%
|
| -9 | Don't know (spontaneous) | 3 |
0.8%
|
| 1 | Yes | 170 |
42.7%
|
| 2 | No | 200 |
50.3%
|
| Sysmiss | 203 |