| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 18 | 
                                                                 
                                    
                                    4.8%
                                 
                                                             | 
                                                        
                    
| 2 | No | 346 | 
                                                                 
                                    
                                    92.3%
                                 
                                                             |