| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    
| -7 | Does not apply (spontaneous) | 30 | 
                                                                 
                                    
                                    5.2%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 229 | 
                                                                 
                                    
                                    39.4%
                                 
                                                             | 
                                                        
                    
| 2 | No | 318 | 
                                                                 
                                    
                                    54.7%
                                 
                                                             |