| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 73 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 4308 | 
                                                                 
                                    
                                    47%
                                 
                                                             | 
                                                        
                    
| 2 | No | 4779 | 
                                                                 
                                    
                                    52.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1512 |