| Value | Category | 
                                    
                    
                        | 1 | Very well maintained | 
                                    
                    
                        | 2 | Well maintained | 
                                    
                    
                        | 3 | Average | 
                                    
                    
                        | 4 | Poor maintenance | 
                                    
                    
                        | 5 | Very poor maintenance | 
                                    
                    
                        | 6 | No buildings | 
                                    
                    
                        | 7 | No proper building | 
                                    
                    
                        | 9 | Others | 
                            
            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.