| Value | Category | 
                
                    
                    
                        | 0 | No | 
                
                    
                    
                        | 1 | Yes | 
                
                    
                    
                        | 3 | Not Sure | 
                
                    
                    
                        | 5 | Missing | 
                
                    
                    
                        | 6 | Other | 
                
                    
                    
                        | 7 | Refusal | 
                
                    
                    
                        | 8 | Don't Know | 
                
                    
                    
                        | 9 | Not applicable | 
                
                    
                    
                        | Sysmiss |  | 
                
            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.