| Value | Category | 
                                    
                    
                        | 1 | 1-Participant HH | 
                                    
                    
                        | 2 | 2-Ineligible HH | 
                                    
                    
                        | 3 | 3-Non-participant Eligible HH | 
                                    
                    
                        | 4 | 4-Non-participant Unknown Eligibility HH | 
                            
            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.