| Value | Category | 
                                    
                    
                        | 1 | Low quality | 
                                    
                    
                        | 2 | Not available | 
                                    
                    
                        | 3 | Do not need | 
                                    
                    
                        | 4 | Too costly | 
                                    
                    
                        | 5 | Takes much time | 
                                    
                    
                        | 6 | Not useful | 
                                    
                    
                        | 7 | Too far | 
                                    
                    
                        | 8 | Spouse does not want | 
                                    
                    
                        | 9 | Other | 
                                    
                    
                        | 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.