| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 1 | Very easy | 325 | 
                                    
                                    27.1%
                                 | 
| 2 | Easy | 277 | 
                                    
                                    23.1%
                                 | 
| 3 | Difficult | 106 | 
                                    
                                    8.8%
                                 | 
| 4 | Very Difficult | 99 | 
                                    
                                    8.3%
                                 | 
| 7 | Not applicable | 393 | 
                                    
                                    32.8%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don't know | 0 | 
                                    
                                    0%
                                 |