| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 1 | Very much difficult | 7 | 
                                    
                                    7.9%
                                 | 
| 2 | Moderately difficult | 11 | 
                                    
                                    12.4%
                                 | 
| 3 | Somewhat difficult | 44 | 
                                    
                                    49.4%
                                 | 
| 4 | Not difficult at all | 27 | 
                                    
                                    30.3%
                                 | 
| Sysmiss | 1327 |