| Value | Category | 
                                    
                    
                        | 1 | Diario | 
                                    
                    
                        | 2 | Semanal | 
                                    
                    
                        | 3 | Quincenal | 
                                    
                    
                        | 4 | Mensual | 
                                    
                    
                        | 5 | Trimestral | 
                                    
                    
                        | 6 | Semestral | 
                                    
                    
                        | 7 | Anual | 
                                    
                    
                        | 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.