| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 1 | Very easy | 27 | 
                                    
                                    1.1%
                                 | 
| 2 | Easy | 58 | 
                                    
                                    2.4%
                                 | 
| 3 | Difficult | 93 | 
                                    
                                    3.9%
                                 | 
| 4 | Very Difficult | 113 | 
                                    
                                    4.7%
                                 | 
| 7 | No contact | 2105 | 
                                    
                                    87.7%
                                 | 
| 8 | Refused | 1 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 3 | 
                                    
                                    0.1%
                                 |