| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 3 | 4 | 
                                                                 
                                    
                                    4.8%
                                 
                                                             | 
                                                        
                    |
| 4 | 6 | 
                                                                 
                                    
                                    7.2%
                                 
                                                             | 
                                                        
                    |
| 5 | 9 | 
                                                                 
                                    
                                    10.8%
                                 
                                                             | 
                                                        
                    |
| 6 | 7 | 
                                                                 
                                    
                                    8.4%
                                 
                                                             | 
                                                        
                    |
| 7 | 21 | 
                                                                 
                                    
                                    25.3%
                                 
                                                             | 
                                                        
                    |
| 8 | 19 | 
                                                                 
                                    
                                    22.9%
                                 
                                                             | 
                                                        
                    |
| 9 | 11 | 
                                                                 
                                    
                                    13.3%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 6 | 
                                                                 
                                    
                                    7.2%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 54 | |
| Sysmiss | 1 |