| Value | Category | 
                                    
                    
                        | 1 | Slightly poor eyesight | 
                                    
                    
                        | 2 | Very poor eyesight | 
                                    
                    
                        | 3 | Totally blind | 
                                    
                    
                        | 4 | Slightly poor hearing | 
                                    
                    
                        | 5 | Very poor hearing | 
                                    
                    
                        | 6 | Totally deaf | 
                                    
                    
                        | 7 | Some difficulty speaking | 
                                    
                    
                        | 8 | Totally dumb | 
                                    
                    
                        | 9 | Difficulty walking | 
                                    
                    
                        | 10 | Totally unable to walk | 
                                    
                    
                        | 11 | Missing arm | 
                                    
                    
                        | 12 | Missing both arms | 
                                    
                    
                        | 13 | Missing leg | 
                                    
                    
                        | 14 | Missing both legs | 
                                    
                    
                        | 15 | Slight reasoning inability | 
                                    
                    
                        | 16 | Profound reasoning inability | 
                                    
                    
                        | 17 | Heart problem | 
                                    
                    
                        | 18 | Lung problem | 
                                    
                    
                        | 19 | Back problem | 
                                    
                    
                        | 20 | Arthritis | 
                                    
                    
                        | 21 | Mental illness | 
                                    
                    
                        | 22 | Other | 
                                    
                    
                        | 88 | Not willing | 
                                    
                    
                        | 99 | Don't know | 
                            
            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.