| Value | Category | 
                                    
                    
                        | 1 | Dia | 
                                    
                    
                        | 2 | Semana | 
                                    
                    
                        | 3 | Catorcena | 
                                    
                    
                        | 4 | Quincenal | 
                                    
                    
                        | 5 | Mes | 
                                    
                    
                        | 6 | Trimestre | 
                                    
                    
                        | 7 | Semestre | 
                                    
                    
                        | 8 | A¤o | 
                                    
                    
                        | 9 | Ignorado | 
                                    
                    
                        | 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.