| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 | 
                                    
                                    6.7%
                                 | 
| 2 | 2 | 
                                    
                                    4.4%
                                 | |
| 3 | 6 | 
                                    
                                    13.3%
                                 | |
| 5 | 6 | 
                                    
                                    13.3%
                                 | |
| 6 | 4 | 
                                    
                                    8.9%
                                 | |
| 7 | 4 | 
                                    
                                    8.9%
                                 | |
| 8 | 7 | 
                                    
                                    15.6%
                                 | |
| 9 | 11 | 
                                    
                                    24.4%
                                 | |
| 10 | Very effective | 2 | 
                                    
                                    4.4%
                                 | 
| 11 | Don't know | 65 | |
| Sysmiss | 33 |