| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    2.5%
                                 | 
| 1 | Very much difficult | 7 | 
                                    
                                    17.5%
                                 | 
| 2 | Moderately difficult | 11 | 
                                    
                                    27.5%
                                 | 
| 3 | Somewhat difficult | 13 | 
                                    
                                    32.5%
                                 | 
| 4 | Not difficult at all | 8 | 
                                    
                                    20%
                                 | 
| Sysmiss | 323 |