| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. higher grade | 6 | 
                                    
                                    12%
                                 | 
| 2 | 2. standard grade | 10 | 
                                    
                                    20%
                                 | 
| 3 | 3. lower grade | 0 | 
                                    
                                    0%
                                 | 
| 7 | 7. did not take | 33 | 
                                    
                                    66%
                                 | 
| 9 | 9. don't know | 1 | 
                                    
                                    2%
                                 | 
| Sysmiss | 949 |