| Value | Category | 
                                    
                    
                        | 0 | NR | 
                                    
                    
                        | 1 | Informant busy | 
                                    
                    
                        | 2 | Informant not co-operative | 
                                    
                    
                        | 3 | Informant not available | 
                                    
                    
                        | 4 |  | 
                                    
                    
                        | 5 |  | 
                                    
                    
                        | 6 |  | 
                                    
                    
                        | 7 |  | 
                                    
                    
                        | 8 | Invalid | 
                                    
                    
                        | 9 | Others | 
                                    
                    
                        | 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.