| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 51 | 
                                                                 
                                    
                                    8.8%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 185 | 
                                                                 
                                    
                                    31.9%
                                 
                                                             | 
                                                        
                    
| 2 | No | 344 | 
                                                                 
                                    
                                    59.3%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1 |