| Value | Category | 
                                    
                    
                        | 1 | younger | 
                                    
                    
                        | 2 | about the same age | 
                                    
                    
                        | 3 | less than 10 years older | 
                                    
                    
                        | 4 | 10 or more years older | 
                                    
                    
                        | 5 | older, don't know difference | 
                                    
                    
                        | 8 | don't know | 
                            
            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.