| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    6.9%
                                 | 
| 1 | Yes | 13 | 
                                    
                                    44.8%
                                 | 
| 2 | No | 14 | 
                                    
                                    48.3%
                                 | 
| Sysmiss | 82 |