| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 5273 | 
                                    
                                    96.2%
                                 | 
| 2 | SOME DIFFICULTY | 65 | 
                                    
                                    1.2%
                                 | 
| 3 | A LOT OF DIFFICULTY | 13 | 
                                    
                                    0.2%
                                 | 
| 4 | CANNOT SEE AT ALL | 7 | 
                                    
                                    0.1%
                                 | 
| 9 | NO RESPONSE | 1 | 
                                    
                                    0%
                                 | 
| Sysmiss | 120 | 
                                    
                                    2.2%
                                 |