| Value | Category | 
                                    
                    
                        | 1 | 1. yes | 
                                    
                    
                        | 2 | 2. no | 
                                    
                    
                        | 997 | 997. Can't Remember | 
                                    
                    
                        | 998 | 998. Refuses to say | 
                                    
                    
                        | 999 | 999. 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.