| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    
| 2 | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 3 | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 4 | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 5 | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 6 | 2 | 
                                                                 
                                    
                                    8.7%
                                 
                                                             | 
                                                        
                    |
| 7 | 3 | 
                                                                 
                                    
                                    13%
                                 
                                                             | 
                                                        
                    |
| 8 | 3 | 
                                                                 
                                    
                                    13%
                                 
                                                             | 
                                                        
                    |
| 9 | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 1 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 13 | 
                                                                 
                                    
                                    56.5%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 4 |