| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    
| 1 | Very much difficult | 8 | 
                                                                 
                                    
                                    6.2%
                                 
                                                             | 
                                                        
                    
| 2 | Moderately difficult | 22 | 
                                                                 
                                    
                                    16.9%
                                 
                                                             | 
                                                        
                    
| 3 | Somewhat difficult | 30 | 
                                                                 
                                    
                                    23.1%
                                 
                                                             | 
                                                        
                    
| 4 | Not difficult at all | 69 | 
                                                                 
                                    
                                    53.1%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 462 |