| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 1 | Very easy | 4 | 
                                    
                                    0.3%
                                 | 
| 2 | Easy | 35 | 
                                    
                                    2.9%
                                 | 
| 3 | Difficult | 70 | 
                                    
                                    5.8%
                                 | 
| 4 | Very Difficult | 84 | 
                                    
                                    7%
                                 | 
| 7 | No contact | 1005 | 
                                    
                                    83.8%
                                 | 
| 8 | Refused | 1 | 
                                    
                                    0.1%
                                 | 
| 9 | Don't know | 1 | 
                                    
                                    0.1%
                                 |