| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 34 | 
                                                                 
                                    
                                    13.4%
                                 
                                                             | 
                                                        
                    
| 2 | 18 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    |
| 3 | 20 | 
                                                                 
                                    
                                    7.9%
                                 
                                                             | 
                                                        
                    |
| 4 | 29 | 
                                                                 
                                    
                                    11.4%
                                 
                                                             | 
                                                        
                    |
| 5 | 35 | 
                                                                 
                                    
                                    13.8%
                                 
                                                             | 
                                                        
                    |
| 6 | 26 | 
                                                                 
                                    
                                    10.2%
                                 
                                                             | 
                                                        
                    |
| 7 | 18 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    |
| 8 | 23 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    |
| 9 | 15 | 
                                                                 
                                    
                                    5.9%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 36 | 
                                                                 
                                    
                                    14.2%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 133 | |
| Sysmiss | 43 |