| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 19538 | 
                                                                 
                                    
                                    87%
                                 
                                                             | 
                                                        
                    
| 2 | SOME DIFFICULTY | 2534 | 
                                                                 
                                    
                                    11.3%
                                 
                                                             | 
                                                        
                    
| 3 | A LOT OF DIFFICULTY | 347 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    
| 4 | CANNOT CONTROL BEHAVIOUR AT ALL | 31 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 9 | NO RESPONSE | 4 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 252 |