| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 549 | 
                                                                 
                                    
                                    65%
                                 
                                                             | 
                                                        
                    
| 2 | No | 287 | 
                                                                 
                                    
                                    34%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 673 |