| Value | Category | 
                                    
                    
                        | 1 | Sí,  (tarjeta vista) | 
                                    
                    
                        | 2 | Sí  (tarjeta no vista) | 
                                    
                    
                        | 3 | No | 
                                    
                    
                        | 7 | Missing | 
                                    
                    
                        | 9 | No sabe/NR | 
                                    
                    
                        | 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.