| Value | Category | 
                                    
                    
                        | 1 | asbestos sheets | 
                                    
                    
                        | 2 | tiles | 
                                    
                    
                        | 3 | iron sheets | 
                                    
                    
                        | 4 | grass/straw/thatch | 
                                    
                    
                        | 5 | concrete | 
                                    
                    
                        | 6 | 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.