| Value | Category | 
                                    
                    
                        | 1 | No oil | 
                                    
                    
                        | 2 | No electricity | 
                                    
                    
                        | 3 | broken down | 
                                    
                    
                        | 4 | gas | 
                                    
                    
                        | 6 | Without battery | 
                                    
                    
                        | 8 | NA | 
                                    
                    
                        | 9 | Don't know | 
                                    
                    
                        | 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.