| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 | 
                                    
                                    4.7%
                                 | 
| 2 | 4 | 
                                    
                                    9.3%
                                 | |
| 3 | 3 | 
                                    
                                    7%
                                 | |
| 4 | 2 | 
                                    
                                    4.7%
                                 | |
| 5 | 5 | 
                                    
                                    11.6%
                                 | |
| 6 | 2 | 
                                    
                                    4.7%
                                 | |
| 7 | 4 | 
                                    
                                    9.3%
                                 | |
| 8 | 13 | 
                                    
                                    30.2%
                                 | |
| 9 | 8 | 
                                    
                                    18.6%
                                 | |
| 10 | Very effective | 0 | 
                                    
                                    0%
                                 | 
| 11 | Don't know | 67 | |
| Sysmiss | 33 |