| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    
| 2 | 3 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 3 | 4 | 
                                                                 
                                    
                                    7.4%
                                 
                                                             | 
                                                        
                    |
| 4 | 5 | 
                                                                 
                                    
                                    9.3%
                                 
                                                             | 
                                                        
                    |
| 5 | 4 | 
                                                                 
                                    
                                    7.4%
                                 
                                                             | 
                                                        
                    |
| 6 | 14 | 
                                                                 
                                    
                                    25.9%
                                 
                                                             | 
                                                        
                    |
| 7 | 9 | 
                                                                 
                                    
                                    16.7%
                                 
                                                             | 
                                                        
                    |
| 8 | 8 | 
                                                                 
                                    
                                    14.8%
                                 
                                                             | 
                                                        
                    |
| 9 | 3 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 1 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 76 | |
| Sysmiss | 8 |