| Value | Category | 
                                    
                    
                        | 10 | Every eligible member of household interviewed | 
                                    
                    
                        | 11 | Some interviewed and some proxied | 
                                    
                    
                        | 12 | Some interviewed/proxied and some non-contact/refusal | 
                                    
                    
                        | 20 | New address - no trace | 
                                    
                    
                        | 21 | Address occupied but no contact | 
                                    
                    
                        | 22 | Refused | 
                                    
                    
                        | 40 | Household infirm, disabled or elderly | 
                                    
                    
                        | 41 | Household institutionalised | 
                                    
                    
                        | 42 | Household moved out of scope | 
                                    
                    
                        | 44 |  | 
                                    
                    
                        | Sysmiss |  | 
                            
            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.