| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 1 | Very easy | 57 | 
                                    
                                    4.8%
                                 | 
| 2 | Easy | 343 | 
                                    
                                    28.6%
                                 | 
| 3 | Difficult | 151 | 
                                    
                                    12.6%
                                 | 
| 4 | Very Difficult | 29 | 
                                    
                                    2.4%
                                 | 
| 7 | No contact | 620 | 
                                    
                                    51.7%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 0 | 
                                    
                                    0%
                                 |