| Value | Category | 
                                    
                    
                        | 9996 | height out of plausible limits | 
                                    
                    
                        | 9997 | age in days out of plausible limits | 
                                    
                    
                        | 9998 | flagged cases | 
                                    
                    
                        | 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.