| Value | Category | 
                                    
                    
                        | 01 | Month, year, and day complete | 
                                    
                    
                        | 02 | Month and year complete | 
                                    
                    
                        | 03 | Year and season | 
                                    
                    
                        | 04 | Year, season, and age - month imputed | 
                                    
                    
                        | 05 | Year and age - month imputed | 
                                    
                    
                        | 06 | Year and age - year ignored | 
                                    
                    
                        | 07 | Month and age - year imputed | 
                                    
                    
                        | 08 | Year - age calculated, month imputed | 
                                    
                    
                        | 09 | Year- age and month imputed | 
                                    
                    
                        | 10 | Age - year calculated, month imputed | 
                                    
                    
                        | 11 | Age - year and month imputed | 
                                    
                    
                        | 12 | Month - age, year imputed | 
                                    
                    
                        | 13 | None - all imputed | 
                                    
                    
                        | 96 | Inconsistent | 
                                    
                    
                        | 99 | NIU (not in universe) | 
                            
            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.