| Value | Category | 
                                    
                    
                        | 1 |  | 
                                    
                    
                        | 2 |  | 
                                    
                    
                        | 3 |  | 
                                    
                    
                        | 4 |  | 
                                    
                    
                        | 6 |  | 
                                    
                    
                        | 7 |  | 
                                    
                    
                        | 10 |  | 
                                    
                    
                        | 365 |  | 
                                    
                    
                        | 995 | 995. Topcode | 
                                    
                    
                        | 996 | 996. N/A | 
                                    
                    
                        | 997 | 997. Refuse | 
                                    
                    
                        | 998 | 998. DK | 
                                    
                    
                        | 999 | 999. Miss | 
                                    
                    
                        | 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.