| 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.