| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 60 | 
                                                                 
                                    
                                    25.3%
                                 
                                                             | 
                                                        
                    
| 2 | 26 | 
                                                                 
                                    
                                    11%
                                 
                                                             | 
                                                        
                    |
| 3 | 22 | 
                                                                 
                                    
                                    9.3%
                                 
                                                             | 
                                                        
                    |
| 4 | 19 | 
                                                                 
                                    
                                    8%
                                 
                                                             | 
                                                        
                    |
| 5 | 23 | 
                                                                 
                                    
                                    9.7%
                                 
                                                             | 
                                                        
                    |
| 6 | 12 | 
                                                                 
                                    
                                    5.1%
                                 
                                                             | 
                                                        
                    |
| 7 | 21 | 
                                                                 
                                    
                                    8.9%
                                 
                                                             | 
                                                        
                    |
| 8 | 13 | 
                                                                 
                                    
                                    5.5%
                                 
                                                             | 
                                                        
                    |
| 9 | 11 | 
                                                                 
                                    
                                    4.6%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 30 | 
                                                                 
                                    
                                    12.7%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 157 | |
| Sysmiss | 36 |