| Value | Category | 
                                    
                    
                        | 00 | No flag | 
                                    
                    
                        | 01 | Number GT interval since birth | 
                                    
                    
                        | 02 | Number plus amenorrhea GT interval | 
                                    
                    
                        | 03 | Number reported, but period not returned | 
                                    
                    
                        | 04 | Reported before last birth, but no birth | 
                                    
                    
                        | 05 | Reported before last birth, but period since | 
                                    
                    
                        | 06 | Reported never menstruated, but period returned | 
                                    
                    
                        | 07 | Reported time during pregnancy | 
                                    
                    
                        | 08 | Reported never menstruated but had kids | 
                                    
                    
                        | 09 | Reported period before last birth | 
                                    
                    
                        | 99 | NIU (not in universe) | 
                            
            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.