| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 14069 | 
                                                                 
                                    
                                    95.8%
                                 
                                                             | 
                                                        
                    
| 2 | SOME DIFFICULTY | 306 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    
| 3 | A LOT OF DIFFICULTY | 98 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    
| 4 | CANNOT SEE AT ALL | 10 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 9 | NO RESPONSE | 2 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 205 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             |