| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 | 
                                    
                                    1%
                                 | 
| 2 | 6 | 
                                    
                                    2%
                                 | |
| 3 | 28 | 
                                    
                                    9.5%
                                 | |
| 4 | 26 | 
                                    
                                    8.8%
                                 | |
| 5 | 50 | 
                                    
                                    16.9%
                                 | |
| 6 | 31 | 
                                    
                                    10.5%
                                 | |
| 7 | 20 | 
                                    
                                    6.8%
                                 | |
| 8 | 26 | 
                                    
                                    8.8%
                                 | |
| 9 | 14 | 
                                    
                                    4.7%
                                 | |
| 10 | Very effective | 9 | 
                                    
                                    3.1%
                                 | 
| 11 | Don't know | 82 | 
                                    
                                    27.8%
                                 | 
| Sysmiss | 6 |