| Value | Category | 
                                    
                    
                        | 1 | 01. Concrete | 
                                    
                    
                        | 2 | 02. Wood | 
                                    
                    
                        | 3 | 03. Metal | 
                                    
                    
                        | 4 | 04. Tiles | 
                                    
                    
                        | 5 | 05. Asbestos | 
                                    
                    
                        | 6 | 06. Foliage | 
                                    
                    
                        | 7 | 07. Other | 
                                    
                    
                        | 98 | 98. DK | 
                                    
                    
                        | 99 | 99. Miss | 
                            
            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.