| Value | Category | 
                                    
                    
                        | 3 | 03. Day | 
                                    
                    
                        | 4 | 04. Week | 
                                    
                    
                        | 5 | 05. Month | 
                                    
                    
                        | 88 | 88. Died bef. fed | 
                                    
                    
                        | 96 | 96. Not fed yet | 
                                    
                    
                        | 98 | 98. DK | 
                                    
                    
                        | 99 | 99. Miss | 
                                    
                    
                        | 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.