| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 4706 | 
                                                                 
                                    
                                    57.1%
                                 
                                                             | 
                                                        
                    
| 2 | Minor difficult | 462 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    
| 3 | Big difficulty | 682 | 
                                                                 
                                    
                                    8.3%
                                 
                                                             | 
                                                        
                    
| 8 | NA | 2372 | |
| 9 | I don’t know | 5 | |
| Sysmiss | 17 |