| Value | Category | 
                                    
                    
                        | 1 | Earth | 
                                    
                    
                        | 2 | Cow dung or cow dung mixed with soil | 
                                    
                    
                        | 3 | Concrete/stone/cement | 
                                    
                    
                        | 4 | Tile/bricks | 
                                    
                    
                        | 5 | Wood | 
                                    
                    
                        | 9 | Missing | 
                                    
                    
                        | 999 |  | 
                            
            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.