| Value | Category | 
                                    
                    
                        | 0 | N/A | 
                                    
                    
                        | 1 | up to 30 years | 
                                    
                    
                        | 2 | 30 - 39 years | 
                                    
                    
                        | 3 | 40 - 49 years | 
                                    
                    
                        | 4 | 50 - 59 years | 
                                    
                    
                        | 5 | 60 - 64 years | 
                                    
                    
                        | 6 | 65 and over | 
                            
            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.