| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 25 | 
                                                                 
                                    
                                    7.3%
                                 
                                                             | 
                                                        
                    
| 2 | 20 | 
                                                                 
                                    
                                    5.9%
                                 
                                                             | 
                                                        
                    |
| 3 | 37 | 
                                                                 
                                    
                                    10.9%
                                 
                                                             | 
                                                        
                    |
| 4 | 35 | 
                                                                 
                                    
                                    10.3%
                                 
                                                             | 
                                                        
                    |
| 5 | 54 | 
                                                                 
                                    
                                    15.8%
                                 
                                                             | 
                                                        
                    |
| 6 | 31 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    |
| 7 | 37 | 
                                                                 
                                    
                                    10.9%
                                 
                                                             | 
                                                        
                    |
| 8 | 23 | 
                                                                 
                                    
                                    6.7%
                                 
                                                             | 
                                                        
                    |
| 9 | 12 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 67 | 
                                                                 
                                    
                                    19.6%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 78 | |
| Sysmiss | 11 |