| Value | Category | 
                                    
                    
                        | 1 | cardboard | 
                                    
                    
                        | 2 | REEDS/STICKS/GRASS | 
                                    
                    
                        | 3 | STONES/MUDBRICKS | 
                                    
                    
                        | 4 | METAL SHEETS/ASBESTOS | 
                                    
                    
                        | 5 | wood | 
                                    
                    
                        | 6 | CUT STONE | 
                                    
                    
                        | 9 | omitted | 
                            
            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.