| Value | Category | 
                                    
                    
                        | 1 | Less  than 6 months | 
                                    
                    
                        | 2 | 6 months but less than 12 months | 
                                    
                    
                        | 3 | 1 year but less than 5 years | 
                                    
                    
                        | 4 | 5 years but less than 10 years | 
                                    
                    
                        | 5 | 10 years and above | 
                            
            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.