| Value | Category | 
                                    
                    
                        | 93 | During first week | 
                                    
                    
                        | 94 | After first week and before the first year | 
                                    
                    
                        | 95 | During infancy | 
                                    
                    
                        | 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.