| Value | Category | 
                                    
                    
                        | 1 | less than 8 hours | 
                                    
                    
                        | 2 | 1 - 3 days | 
                                    
                    
                        | 3 | 4 - 5 days | 
                                    
                    
                        | 4 | 2 - 4 weeks | 
                                    
                    
                        | 5 | 2 - 3 months | 
                                    
                    
                        | 6 | 4 - 6 months | 
                                    
                    
                        | 7 | 6 months to 1 year | 
                            
            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.