| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 3812 | 
                                                                 
                                    
                                    96.1%
                                 
                                                             | 
                                                        
                    
| 2 | Some difficulty | 132 | 
                                                                 
                                    
                                    3.3%
                                 
                                                             | 
                                                        
                    
| 3 | A lot of difficulty | 19 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    
| 4 | Cannot be understood at all | 4 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 9 | No response | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 362 |