| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    1.2%
                                 | 
| 1 | Very much difficult | 11 | 
                                    
                                    6.5%
                                 | 
| 2 | Moderately difficult | 22 | 
                                    
                                    13%
                                 | 
| 3 | Somewhat difficult | 77 | 
                                    
                                    45.6%
                                 | 
| 4 | Not difficult at all | 57 | 
                                    
                                    33.7%
                                 | 
| Sysmiss | 443 |