| Value | Category | 
                                    
                    
                        | A | A | 
                                    
                    
                        | B | B | 
                                    
                    
                        | C | C | 
                                    
                    
                        | D | D | 
                                    
                    
                        | E | E | 
                                    
                    
                        | F | F | 
                                    
                    
                        | G | G | 
                                    
                    
                        | H | H | 
                                    
                    
                        | I | I | 
                                    
                    
                        | J | J | 
                                    
                    
                        | K | K | 
                                    
                    
                        | L | L | 
                                    
                    
                        | M | M | 
                                    
                    
                        | N | N | 
                                    
                    
                        | O | O | 
                                    
                    
                        | P | P | 
                                    
                    
                        | Q | Q | 
                                    
                    
                        | R | R | 
                                    
                    
                        | S | S | 
                                    
                    
                        | T | T | 
                                    
                    
                        | U | U | 
                            
            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.