| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 27 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 5850 | 
                                                                 
                                    
                                    54.8%
                                 
                                                             | 
                                                        
                    
| 2 | No | 4795 | 
                                                                 
                                    
                                    44.9%
                                 
                                                             |