| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    0.7%
                                 | 
| 1 | Very much difficult | 36 | 
                                    
                                    25.2%
                                 | 
| 2 | Moderately difficult | 60 | 
                                    
                                    42%
                                 | 
| 3 | Somewhat difficult | 22 | 
                                    
                                    15.4%
                                 | 
| 4 | Not difficult at all | 24 | 
                                    
                                    16.8%
                                 | 
| Sysmiss | 259 |