| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 7 | 
                                    
                                    3.6%
                                 | 
| 2 | 5 | 
                                    
                                    2.6%
                                 | |
| 3 | 13 | 
                                    
                                    6.8%
                                 | |
| 4 | 14 | 
                                    
                                    7.3%
                                 | |
| 5 | 22 | 
                                    
                                    11.5%
                                 | |
| 6 | 21 | 
                                    
                                    10.9%
                                 | |
| 7 | 20 | 
                                    
                                    10.4%
                                 | |
| 8 | 22 | 
                                    
                                    11.5%
                                 | |
| 9 | 25 | 
                                    
                                    13%
                                 | |
| 10 | Very effective | 43 | 
                                    
                                    22.4%
                                 | 
| 11 | Don't know | 74 | |
| Sysmiss | 53 |