| Value | Category | 
                                    
                    
                        | 1 | centralized system | 
                                    
                    
                        | 2 | spring water,well | 
                                    
                    
                        | 3 | own system | 
                                    
                    
                        | 4 | river,lake | 
                                    
                    
                        | 5 | rain water | 
                                    
                    
                        | 6 | water vendor | 
                                    
                    
                        | 7 | 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.