| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 9413 | 
                                    
                                    92.5%
                                 | 
| 2 | SOME DIFFICULTY | 670 | 
                                    
                                    6.6%
                                 | 
| 3 | A LOT OF DIFFICULTY | 59 | 
                                    
                                    0.6%
                                 | 
| 4 | CANNOT LEARN AT ALL | 33 | 
                                    
                                    0.3%
                                 | 
| 9 | NO RESPONSE | 5 | 
                                    
                                    0%
                                 | 
| Sysmiss | 6509 |