| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 10 | 
                                    
                                    1.6%
                                 | 
| 2 | 3 | 
                                    
                                    0.5%
                                 | |
| 3 | 16 | 
                                    
                                    2.6%
                                 | |
| 4 | 29 | 
                                    
                                    4.7%
                                 | |
| 5 | 79 | 
                                    
                                    12.8%
                                 | |
| 6 | 98 | 
                                    
                                    15.8%
                                 | |
| 7 | 98 | 
                                    
                                    15.8%
                                 | |
| 8 | 118 | 
                                    
                                    19.1%
                                 | |
| 9 | 95 | 
                                    
                                    15.3%
                                 | |
| 10 | Very effective | 48 | 
                                    
                                    7.8%
                                 | 
| 11 | Don't know | 25 | 
                                    
                                    4%
                                 | 
| Sysmiss | 5 |