| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 773 | 
                                                                 
                                    
                                    53.3%
                                 
                                                             | 
                                                        
                    
| 2 | No | 669 | 
                                                                 
                                    
                                    46.1%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 9222 |