| Value | Category | 
                                    
                    
                        | -3 | Missing | 
                                    
                    
                        | 1 | In an institution (e.g. hospital prison) | 
                                    
                    
                        | 2 | Studying away from home | 
                                    
                    
                        | 3 | On holiday | 
                                    
                    
                        | 4 | Away on business/for work | 
                                    
                    
                        | 5 | Unable to be contacted | 
                                    
                    
                        | 6 | Permanently too unwell or disabled | 
                                    
                    
                        | 7 | Temporarily unwell | 
                                    
                    
                        | 8 | Too old | 
                                    
                    
                        | 9 | Deaf or has speech problems | 
                                    
                    
                        | 10 | Has language problems | 
                                    
                    
                        | 11 | Refused but allowed a proxy | 
                                    
                    
                        | 12 | Temporarily away from home for other reasons | 
                            
            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.