| Value | Category | 
                                    
                    
                        | 0 |  | 
                                    
                    
                        | 1 | much better | 
                                    
                    
                        | 2 | some what better | 
                                    
                    
                        | 3 | nearly the same | 
                                    
                    
                        | 4 | some what worse | 
                                    
                    
                        | 5 | worse | 
                                    
                    
                        | 6 |  | 
                                    
                    
                        | 7 |  | 
                                    
                    
                        | 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.