| Value | Category | 
                                    
                    
                        | 0 |  | 
                                    
                    
                        | 1 | during pregnancy | 
                                    
                    
                        | 2 | during delivery | 
                                    
                    
                        | 3 | during abortion | 
                                    
                    
                        | 4 | within 6 weeks after delivery/abortion | 
                                    
                    
                        | 9 | others | 
                                    
                    
                        | Sysmiss |  | 
                            
            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.