| Value | Category | 
                                    
                    
                        | 0 |  | 
                                    
                    
                        | 1 | Por cañería dentro de la vivienda | 
                                    
                    
                        | 2 | Fuera de la vivienda pero dentro del terreno | 
                                    
                    
                        | 3 | Fuera del terreno | 
                                    
                    
                        | 9 | Ns./Nr. | 
                            
            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.