| Value | Category | 
                                    
                    
                        | 1 | during her period | 
                                    
                    
                        | 2 | after period ended | 
                                    
                    
                        | 3 | middle of the cycle | 
                                    
                    
                        | 4 | before period begins | 
                                    
                    
                        | 5 | at any time | 
                                    
                    
                        | 6 | other | 
                                    
                    
                        | 8 | don't know | 
                                    
                    
                        | 1000000001 | .Z | 
                            
            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.