| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 1 | Very easy | 35 | 
                                    
                                    2.9%
                                 | 
| 2 | Easy | 165 | 
                                    
                                    13.8%
                                 | 
| 3 | Difficult | 470 | 
                                    
                                    39.2%
                                 | 
| 4 | Very difficult | 446 | 
                                    
                                    37.2%
                                 | 
| 9 | Don't Know | 84 | 
                                    
                                    7%
                                 | 
| 98 | Refused | 0 | 
                                    
                                    0%
                                 |