| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 5 | 
                                    
                                    2.5%
                                 | 
| 2 | 3 | 
                                    
                                    1.5%
                                 | |
| 3 | 7 | 
                                    
                                    3.4%
                                 | |
| 4 | 12 | 
                                    
                                    5.9%
                                 | |
| 5 | 28 | 
                                    
                                    13.8%
                                 | |
| 6 | 29 | 
                                    
                                    14.3%
                                 | |
| 7 | 17 | 
                                    
                                    8.4%
                                 | |
| 8 | 28 | 
                                    
                                    13.8%
                                 | |
| 9 | 29 | 
                                    
                                    14.3%
                                 | |
| 10 | Very effective | 45 | 
                                    
                                    22.2%
                                 | 
| 11 | Don't know | 62 | |
| Sysmiss | 54 |