| Value | Category | 
                                    
                    
                        | -999 | -999 | 
                                    
                    
                        | -888 | -888 | 
                                    
                    
                        | 1 | Kerosine/Paraffin/Gas/Oil lamp | 
                                    
                    
                        | 2 | Electricity | 
                                    
                    
                        | 3 | Charcoal | 
                                    
                    
                        | 4 | Open fire | 
                                    
                    
                        | 5 | Firewood | 
                                    
                    
                        | 6 | 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.