| Value | Category | 
                                    
                    
                        | 1 | ANSWER TO ALL THREE QUESTIONS WAS ALWAYS 'NO' | 
                                    
                    
                        | 2 | ANSWER TO ALL THREE QUESTIONS WAS NOT ALWAYS 'NO' | 
                            
            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.