| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 39 | 
                                                                 
                                    
                                    19.7%
                                 
                                                             | 
                                                        
                    
| 2 | 22 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    |
| 3 | 21 | 
                                                                 
                                    
                                    10.6%
                                 
                                                             | 
                                                        
                    |
| 4 | 22 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    |
| 5 | 23 | 
                                                                 
                                    
                                    11.6%
                                 
                                                             | 
                                                        
                    |
| 6 | 18 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    |
| 7 | 15 | 
                                                                 
                                    
                                    7.6%
                                 
                                                             | 
                                                        
                    |
| 8 | 10 | 
                                                                 
                                    
                                    5.1%
                                 
                                                             | 
                                                        
                    |
| 9 | 10 | 
                                                                 
                                    
                                    5.1%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 18 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 183 | |
| Sysmiss | 49 |