| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                    
                                    9.4%
                                 | 
| 1 | Very much difficult | 4 | 
                                    
                                    12.5%
                                 | 
| 2 | Moderately difficult | 14 | 
                                    
                                    43.8%
                                 | 
| 3 | Somewhat difficult | 9 | 
                                    
                                    28.1%
                                 | 
| 4 | Not difficult at all | 2 | 
                                    
                                    6.3%
                                 | 
| Sysmiss | 79 |