| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    
| -7 | Does not apply (spontaneous) | 77 | 
                                                                 
                                    
                                    13.3%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 39 | 
                                                                 
                                    
                                    6.7%
                                 
                                                             | 
                                                        
                    
| 2 | No | 459 | 
                                                                 
                                    
                                    79%
                                 
                                                             |