| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 884 | 
                                    
                                    56.5%
                                 | 
| 2 | SOME DIFFICULTY | 48 | 
                                    
                                    3.1%
                                 | 
| 3 | A LOT OF DIFFICULTY | 4 | 
                                    
                                    0.3%
                                 | 
| 4 | CANNOT LEARN THINGS AT ALL | 1 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 627 | 
                                    
                                    40.1%
                                 |