| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 454 | 
                                                                 
                                    
                                    96.6%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 10 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    
| 8 | Not sure | 6 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 6011 |