| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. higher grade | 4 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    
| 2 | 2. standard grade | 4 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    
| 3 | 3. lower grade | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 7 | 7. did not take | 16 | 
                                                                 
                                    
                                    21.3%
                                 
                                                             | 
                                                        
                    
| 9 | 9. don't know | 51 | 
                                                                 
                                    
                                    68%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 924 |