| Value | Category | 
                                    
                    
                        | 1 | Original hhold surveyed | 
                                    
                    
                        | 2 | Subs.household surveyed | 
                                    
                    
                        | 3 | Not surveyed | 
                                    
                    
                        | 4 |  | 
                                    
                    
                        | 7 |  | 
                                    
                    
                        | 8 |  | 
                                    
                    
                        | 9 | Invalid | 
                                    
                    
                        | 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.