| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 18 | 
                                                                 
                                    
                                    4.9%
                                 
                                                             | 
                                                        
                    
| 2 | 23 | 
                                                                 
                                    
                                    6.2%
                                 
                                                             | 
                                                        
                    |
| 3 | 49 | 
                                                                 
                                    
                                    13.2%
                                 
                                                             | 
                                                        
                    |
| 4 | 73 | 
                                                                 
                                    
                                    19.7%
                                 
                                                             | 
                                                        
                    |
| 5 | 95 | 
                                                                 
                                    
                                    25.6%
                                 
                                                             | 
                                                        
                    |
| 6 | 63 | 
                                                                 
                                    
                                    17%
                                 
                                                             | 
                                                        
                    |
| 7 | 25 | 
                                                                 
                                    
                                    6.7%
                                 
                                                             | 
                                                        
                    |
| 8 | 17 | 
                                                                 
                                    
                                    4.6%
                                 
                                                             | 
                                                        
                    |
| 9 | 2 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 6 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 103 | |
| Sysmiss | 4 |