| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 10162 | 
                                    
                                    71.1%
                                 | 
| 2 | SOME DIFFICULTY | 1472 | 
                                    
                                    10.3%
                                 | 
| 3 | A LOT OF DIFFICULTY | 148 | 
                                    
                                    1%
                                 | 
| 4 | CANNOT REMEMBER/ CONCENTRATE AT ALL | 1 | 
                                    
                                    0%
                                 | 
| 9 | NO RESPONSE | 7 | 
                                    
                                    0%
                                 | 
| Sysmiss | 2507 | 
                                    
                                    17.5%
                                 |