| Value | Category | 
                                    
                    
                        | -99 | DK | 
                                    
                    
                        | -88 | Missing | 
                                    
                    
                        | -77 | NA | 
                                    
                    
                        | 1 | Human and stick | 
                                    
                    
                        | 2 | Human and sheller | 
                                    
                    
                        | 3 | Animal | 
                                    
                    
                        | 4 | Mechanical | 
                                    
                    
                        | 5 | Other | 
                                    
                    
                        | 6 | Not applicable | 
                                    
                    
                        | 7 | Human only | 
                            
            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.