| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 | 
                                    
                                    1.3%
                                 | 
| 2 | 3 | 
                                    
                                    1.3%
                                 | |
| 3 | 10 | 
                                    
                                    4.5%
                                 | |
| 4 | 13 | 
                                    
                                    5.8%
                                 | |
| 5 | 33 | 
                                    
                                    14.8%
                                 | |
| 6 | 18 | 
                                    
                                    8.1%
                                 | |
| 7 | 32 | 
                                    
                                    14.3%
                                 | |
| 8 | 29 | 
                                    
                                    13%
                                 | |
| 9 | 35 | 
                                    
                                    15.7%
                                 | |
| 10 | Very effective | 47 | 
                                    
                                    21.1%
                                 | 
| 11 | Don't know | 45 | |
| Sysmiss | 51 |