| Value | Category | 
                                    
                    
                        | 1 | Up to 6 month | 
                                    
                    
                        | 2 | 6 - 12 months | 
                                    
                    
                        | 3 | 1 - 3 years | 
                                    
                    
                        | 4 | 3 - 5 years | 
                                    
                    
                        | 5 | 5 years and more | 
                                    
                    
                        | Sysmiss |  | 
                            
            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.