| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 15 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    
| 2 | 20 | 
                                                                 
                                    
                                    4.9%
                                 
                                                             | 
                                                        
                    |
| 3 | 62 | 
                                                                 
                                    
                                    15%
                                 
                                                             | 
                                                        
                    |
| 4 | 95 | 
                                                                 
                                    
                                    23.1%
                                 
                                                             | 
                                                        
                    |
| 5 | 95 | 
                                                                 
                                    
                                    23.1%
                                 
                                                             | 
                                                        
                    |
| 6 | 52 | 
                                                                 
                                    
                                    12.6%
                                 
                                                             | 
                                                        
                    |
| 7 | 28 | 
                                                                 
                                    
                                    6.8%
                                 
                                                             | 
                                                        
                    |
| 8 | 21 | 
                                                                 
                                    
                                    5.1%
                                 
                                                             | 
                                                        
                    |
| 9 | 15 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 9 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 62 | |
| Sysmiss | 4 |