| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 1 | Very much difficult | 2 | 
                                    
                                    16.7%
                                 | 
| 2 | Moderately difficult | 3 | 
                                    
                                    25%
                                 | 
| 3 | Somewhat difficult | 2 | 
                                    
                                    16.7%
                                 | 
| 4 | Not difficult at all | 5 | 
                                    
                                    41.7%
                                 | 
| Sysmiss | 138 |