| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 13561 | 
                                                                 
                                    
                                    92.3%
                                 
                                                             | 
                                                        
                    
| 2 | SOME DIFFICULTY | 808 | 
                                                                 
                                    
                                    5.5%
                                 
                                                             | 
                                                        
                    
| 3 | A LOT OF DIFFICULTY | 67 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    
| 4 | CANNOT CONCENTRATE AT ALL | 43 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| 9 | NO RESPONSE | 6 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 205 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             |