| Value | Category | 
                                    
                    
                        | 1 | brick, stone and concrete | 
                                    
                    
                        | 2 | brick, stone and mud | 
                                    
                    
                        | 3 | wood & tree branches | 
                                    
                    
                        | 4 | reinforced concrete | 
                                    
                    
                        | 5 | mud bricks | 
                                    
                    
                        | 6 | other material | 
                                    
                    
                        | 7 | no walls | 
                            
            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.