| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 109 | 
                                                                 
                                    
                                    29.9%
                                 
                                                             | 
                                                        
                    
| 2 | No | 251 | 
                                                                 
                                    
                                    69%
                                 
                                                             |