| Value | Category | 
                                    
                    
                        | 1 | 1. Excellent | 
                                    
                    
                        | 2 | 2. Good | 
                                    
                    
                        | 3 | 3. Fair | 
                                    
                    
                        | 4 | 4. Not good | 
                                    
                    
                        | 5 | 5. Very bad | 
                                    
                    
                        | 9 | 9. Miss | 
                                    
                    
                        | 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.