| Value | Category | 
                                    
                    
                        | A | A | 
                                    
                    
                        | AB | AB | 
                                    
                    
                        | ABD | ABD | 
                                    
                    
                        | AC | AC | 
                                    
                    
                        | AD | AD | 
                                    
                    
                        | AF | AF | 
                                    
                    
                        | AX | AX | 
                                    
                    
                        | B | B | 
                                    
                    
                        | BC | BC | 
                                    
                    
                        | BCD | BCD | 
                                    
                    
                        | BCDE | BCDE | 
                                    
                    
                        | BD | BD | 
                                    
                    
                        | BDF | BDF | 
                                    
                    
                        | BF | BF | 
                                    
                    
                        | C | C | 
                                    
                    
                        | CD | CD | 
                                    
                    
                        | CDE | CDE | 
                                    
                    
                        | D | D | 
                                    
                    
                        | E | E | 
                                    
                    
                        | X | X | 
                            
            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.