| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 27 | 
                                                                 
                                    
                                    7.3%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 66 | 
                                                                 
                                    
                                    17.9%
                                 
                                                             | 
                                                        
                    
| 2 | No | 275 | 
                                                                 
                                    
                                    74.7%
                                 
                                                             |