| Value | Category | 
                                    
                    
                        | 1 | home(inside) | 
                                    
                    
                        | 2 | home (outside) | 
                                    
                    
                        | 3 | road | 
                                    
                    
                        | 4 | school | 
                                    
                    
                        | 5 | farm | 
                                    
                    
                        | 6 | park | 
                                    
                    
                        | 7 | river/lake | 
                                    
                    
                        | 8 | industrial area | 
                                    
                    
                        | 96 | other | 
                                    
                    
                        | 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.