| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 36 | 
                                                                 
                                    
                                    19.5%
                                 
                                                             | 
                                                        
                    
| 2 | 21 | 
                                                                 
                                    
                                    11.4%
                                 
                                                             | 
                                                        
                    |
| 3 | 16 | 
                                                                 
                                    
                                    8.6%
                                 
                                                             | 
                                                        
                    |
| 4 | 15 | 
                                                                 
                                    
                                    8.1%
                                 
                                                             | 
                                                        
                    |
| 5 | 26 | 
                                                                 
                                    
                                    14.1%
                                 
                                                             | 
                                                        
                    |
| 6 | 27 | 
                                                                 
                                    
                                    14.6%
                                 
                                                             | 
                                                        
                    |
| 7 | 10 | 
                                                                 
                                    
                                    5.4%
                                 
                                                             | 
                                                        
                    |
| 8 | 10 | 
                                                                 
                                    
                                    5.4%
                                 
                                                             | 
                                                        
                    |
| 9 | 7 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 17 | 
                                                                 
                                    
                                    9.2%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 204 | |
| Sysmiss | 41 |