| Value | Category | 
                                    
                    
                        | 1 | less than 50% | 
                                    
                    
                        | 2 | between 50% and 60% | 
                                    
                    
                        | 3 | between 60% and 70% | 
                                    
                    
                        | 4 | between 70% and 80% | 
                                    
                    
                        | 5 | between 80% and90% | 
                                    
                    
                        | 6 | more than 90% | 
                            
            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.