| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 919 | 
                                    
                                    58.8%
                                 | 
| 2 | SOME DIFFICULTY | 13 | 
                                    
                                    0.8%
                                 | 
| 3 | A LOT OF DIFFICULTY | 5 | 
                                    
                                    0.3%
                                 | 
| Sysmiss | 627 | 
                                    
                                    40.1%
                                 |