| Value | Category | 
                                    
                    
                        | 1 | Very bad | 
                                    
                    
                        | 2 | Bad | 
                                    
                    
                        | 3 | Marginally bad | 
                                    
                    
                        | 4 | Marginally good | 
                                    
                    
                        | 5 | Good | 
                                    
                    
                        | 6 | Very good | 
                                    
                    
                        | 8 | Not applicable | 
                                    
                    
                        | 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.