| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 84 | 
                                                                 
                                    
                                    10.9%
                                 
                                                             | 
                                                        
                    
| 2 | No | 678 | 
                                                                 
                                    
                                    87.8%
                                 
                                                             |