| Value | Category | 
                                    
                    
                        | -999999999 | missing | 
                                    
                    
                        | 1 | No need | 
                                    
                    
                        | 2 | Too far | 
                                    
                    
                        | 3 | Too expensive | 
                                    
                    
                        | 4 | Bad quality | 
                                    
                    
                        | 5 | Doesn't know any | 
                                    
                    
                        | 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.