| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 30 | 
                                                                 
                                    
                                    11.6%
                                 
                                                             | 
                                                        
                    
| 2 | 13 | 
                                                                 
                                    
                                    5%
                                 
                                                             | 
                                                        
                    |
| 3 | 27 | 
                                                                 
                                    
                                    10.4%
                                 
                                                             | 
                                                        
                    |
| 4 | 23 | 
                                                                 
                                    
                                    8.9%
                                 
                                                             | 
                                                        
                    |
| 5 | 34 | 
                                                                 
                                    
                                    13.1%
                                 
                                                             | 
                                                        
                    |
| 6 | 32 | 
                                                                 
                                    
                                    12.4%
                                 
                                                             | 
                                                        
                    |
| 7 | 28 | 
                                                                 
                                    
                                    10.8%
                                 
                                                             | 
                                                        
                    |
| 8 | 18 | 
                                                                 
                                    
                                    6.9%
                                 
                                                             | 
                                                        
                    |
| 9 | 20 | 
                                                                 
                                    
                                    7.7%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 34 | 
                                                                 
                                    
                                    13.1%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 134 | |
| Sysmiss | 37 |