| Value | Category | 
                                    
                    
                        | 1 | GRASS | 
                                    
                    
                        | 2 | IRON SHEETS | 
                                    
                    
                        | 3 | CLAY TILES | 
                                    
                    
                        | 4 | CONCRETE | 
                                    
                    
                        | 5 | PLASTIC SHEETING | 
                                    
                    
                        | 6 | OTHER (SPECIFY) | 
                            
            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.