| Value | Category | 
                                    
                    
                        | -99 | DK | 
                                    
                    
                        | -88 | Missing | 
                                    
                    
                        | -77 | NA | 
                                    
                    
                        | 1 | Yes, Husband | 
                                    
                    
                        | 2 | Yes, Wife | 
                                    
                    
                        | 3 | Yes, Husband and wife | 
                                    
                    
                        | 4 | No | 
                            
            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.