| Value | Category | 
                                    
                    
                        | 0 | not rsi | 
                                    
                    
                        | 1 | rsi | 
                                    
                    
                        | 8 | rsi chosen; hh and rsi questionnaires not completed | 
                                    
                    
                        | 9 | roster data valid; rsi questionnaire not completed | 
                            
            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.