| Value | Category | 
                                    
                    
                        | 0 | Not given | 
                                    
                    
                        | 44 | Marked on card | 
                                    
                    
                        | 66 | Mother reported | 
                                    
                    
                        | 97 | Inconsistent | 
                                    
                    
                        | 98 | DK | 
                                    
                    
                        | 99 | Missing | 
                            
            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.