| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 5087 | 
                                                                 
                                    
                                    81.2%
                                 
                                                             | 
                                                        
                    
| 2 | Some difficulty | 1066 | 
                                                                 
                                    
                                    17%
                                 
                                                             | 
                                                        
                    
| 3 | A lot of difficulty | 94 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    
| 4 | Cannot remember/concentrate at all | 3 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9 | No response | 12 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 2271 |