| 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.