| Value | Category | 
                                    
                    
                        | 1 | Grass | 
                                    
                    
                        | 2 | Mud | 
                                    
                    
                        | 3 | Compacted earth | 
                                    
                    
                        | 4 | Mud brick | 
                                    
                    
                        | 5 | Burnt bricks | 
                                    
                    
                        | 6 | Concrete | 
                                    
                    
                        | 7 | Wood | 
                                    
                    
                        | 8 | Iron sheets | 
                                    
                    
                        | 9 | Other (specify) | 
                            
            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.