| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 36 | 
                                                                 
                                    
                                    17.6%
                                 
                                                             | 
                                                        
                    
| 2 | 12 | 
                                                                 
                                    
                                    5.9%
                                 
                                                             | 
                                                        
                    |
| 3 | 13 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    |
| 4 | 23 | 
                                                                 
                                    
                                    11.2%
                                 
                                                             | 
                                                        
                    |
| 5 | 26 | 
                                                                 
                                    
                                    12.7%
                                 
                                                             | 
                                                        
                    |
| 6 | 28 | 
                                                                 
                                    
                                    13.7%
                                 
                                                             | 
                                                        
                    |
| 7 | 20 | 
                                                                 
                                    
                                    9.8%
                                 
                                                             | 
                                                        
                    |
| 8 | 11 | 
                                                                 
                                    
                                    5.4%
                                 
                                                             | 
                                                        
                    |
| 9 | 12 | 
                                                                 
                                    
                                    5.9%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 24 | 
                                                                 
                                    
                                    11.7%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 183 | |
| Sysmiss | 42 |