| Value | Category | 
                                    
                    
                        | 31 | 31+ days | 
                                    
                    
                        | 95 | Within last 4 weeks | 
                                    
                    
                        | 96 | Before last birth | 
                                    
                    
                        | 97 | Inconsistent | 
                                    
                    
                        | 98 | Don't know | 
                            
            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.