| Value | Category | 
                                    
                    
                        | 1 | Cement or brick | 
                                    
                    
                        | 2 | Wood | 
                                    
                    
                        | 3 | Wood and cement or brick | 
                                    
                    
                        | 4 | Local materials | 
                                    
                    
                        | 5 | Re-used materials | 
                                    
                    
                        | 6 | Other | 
                            
            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.