| Value | Category | 
                                    
                    
                        | 1 | menos de 1 mês | 
                                    
                    
                        | 2 | entre 1 - 3 meses | 
                                    
                    
                        | 3 | entre 4 - 6 meses | 
                                    
                    
                        | 4 | entre 7-12  meses | 
                                    
                    
                        | 5 | mais de 12 meses | 
                                    
                    
                        | 8 |  | 
                                    
                    
                        | 9 |  | 
                                    
                    
                        | 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.