| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 | 
                                    
                                    4.8%
                                 | 
| 2 | 3 | 
                                    
                                    4.8%
                                 | |
| 3 | 4 | 
                                    
                                    6.5%
                                 | |
| 4 | 4 | 
                                    
                                    6.5%
                                 | |
| 5 | 9 | 
                                    
                                    14.5%
                                 | |
| 6 | 6 | 
                                    
                                    9.7%
                                 | |
| 7 | 13 | 
                                    
                                    21%
                                 | |
| 8 | 8 | 
                                    
                                    12.9%
                                 | |
| 9 | 11 | 
                                    
                                    17.7%
                                 | |
| 10 | Very effective | 1 | 
                                    
                                    1.6%
                                 | 
| 11 | Don't know | 49 | |
| Sysmiss | 32 |