| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 1 | Very much difficult | 12 | 
                                    
                                    38.7%
                                 | 
| 2 | Moderately difficult | 9 | 
                                    
                                    29%
                                 | 
| 3 | Somewhat difficult | 9 | 
                                    
                                    29%
                                 | 
| 4 | Not difficult at all | 1 | 
                                    
                                    3.2%
                                 | 
| Sysmiss | 126 |