| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 11561 | 
                                    
                                    80.9%
                                 | 
| 2 | SOME DIFFICULTY | 211 | 
                                    
                                    1.5%
                                 | 
| 3 | A LOT OF DIFFICULTY | 10 | 
                                    
                                    0.1%
                                 | 
| 9 | NO RESPONSE | 8 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 2507 | 
                                    
                                    17.5%
                                 |