| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 4 | 
                                    
                                    3.9%
                                 | 
| 2 | 3 | 
                                    
                                    2.9%
                                 | |
| 3 | 3 | 
                                    
                                    2.9%
                                 | |
| 4 | 3 | 
                                    
                                    2.9%
                                 | |
| 5 | 10 | 
                                    
                                    9.8%
                                 | |
| 6 | 11 | 
                                    
                                    10.8%
                                 | |
| 7 | 10 | 
                                    
                                    9.8%
                                 | |
| 8 | 3 | 
                                    
                                    2.9%
                                 | |
| 9 | 5 | 
                                    
                                    4.9%
                                 | |
| 10 | Very effective | 2 | 
                                    
                                    2%
                                 | 
| 11 | Don't know | 48 | 
                                    
                                    47.1%
                                 | 
| Sysmiss | 10 |