| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 1492 | 
                                    
                                    69.3%
                                 | 
| 2 | SOME DIFFICULTY | 354 | 
                                    
                                    16.4%
                                 | 
| 3 | A LOT OF DIFFICULTY | 19 | 
                                    
                                    0.9%
                                 | 
| 4 | CANNOT REMEMBER/CONCENTRATE AT ALL | 1 | 
                                    
                                    0%
                                 | 
| Sysmiss | 287 | 
                                    
                                    13.3%
                                 |