| Value | Category | 
                                    
                    
                        | 1 | Boil | 
                                    
                    
                        | 2 | Add chlorine | 
                                    
                    
                        | 3 | Strain using a cloth | 
                                    
                    
                        | 4 | Use a water filter | 
                                    
                    
                        | 5 | Other (specify) | 
                                    
                    
                        | 6 | Do not know | 
                                    
                    
                        | 9 |  | 
                                    
                    
                        | Sysmiss |  | 
                            
            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.