| Value | Category | 
                                    
                    
                        | 0 | No flag | 
                                    
                    
                        | 1 | After interview | 
                                    
                    
                        | 2 | After concep >= 1 yr | 
                                    
                    
                        | 3 | After concep < 1 yr | 
                                    
                    
                        | 4 | At marr, never marr | 
                                    
                    
                        | 5 | At marr,after concep | 
                                    
                    
                        | 6 | After marriage | 
                            
            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.