| Value | Category | 
                                    
                    
                        | 1 | 1. Yes | 
                                    
                    
                        | 2 | 2. No | 
                                    
                    
                        | 990 | 990. Answer given not on list | 
                                    
                    
                        | 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.