| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 1286 | 
                                    
                                    87%
                                 | 
| 2 | SOME DIFFICULTY | 125 | 
                                    
                                    8.5%
                                 | 
| 3 | A LOT OF DIFFICULTY | 15 | 
                                    
                                    1%
                                 | 
| 4 | CANNOT LEAR THINGS AT ALL | 5 | 
                                    
                                    0.3%
                                 | 
| Sysmiss | 48 | 
                                    
                                    3.2%
                                 |