| Value | Category | 
                                    
                    
                        | 1 | 1. 0 - 20 % | 
                                    
                    
                        | 2 | 2. 21 - 39 % | 
                                    
                    
                        | 3 | 3. 40 - 49 % | 
                                    
                    
                        | 4 | 4. 50 - 59 % | 
                                    
                    
                        | 5 | 5. 60 - 69 % | 
                                    
                    
                        | 6 | 6. 70 - 79 % | 
                                    
                    
                        | 7 | 7. 80 - 100 % | 
                                    
                    
                        | 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.