| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| -7 | Does not apply (spontaneous) | 111 | 
                                                                 
                                    
                                    19.1%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 87 | 
                                                                 
                                    
                                    15%
                                 
                                                             | 
                                                        
                    
| 2 | No | 381 | 
                                                                 
                                    
                                    65.6%
                                 
                                                             |