| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 37 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    
| -7 | Not applicable (spontaneous) | 161 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 2564 | 
                                                                 
                                    
                                    55.3%
                                 
                                                             | 
                                                        
                    
| 2 | No | 1872 | 
                                                                 
                                    
                                    40.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 6038 |