| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 3178 | 
                                                                 
                                    
                                    80.1%
                                 
                                                             | 
                                                        
                    
| 2 | Some difficulty | 636 | 
                                                                 
                                    
                                    16%
                                 
                                                             | 
                                                        
                    
| 3 | A lot of difficulty | 133 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    
| 4 | Cannot control behaviour at all | 16 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    
| 9 | No response | 4 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 362 |