| Value | Category | 
                                    
                    
                        | 1 | LESS THAN ONE WEEK | 
                                    
                    
                        | 2 | 1 TO 4 WEEKS | 
                                    
                    
                        | 3 | 1 TO 6 MONTHS | 
                                    
                    
                        | 4 | 6 TO 12 MONTHS | 
                                    
                    
                        | 5 | MORE THAN 12 MONTHS | 
                                    
                    
                        | 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.