| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 | 
                                    
                                    7.9%
                                 | 
| 2 | 3 | 
                                    
                                    7.9%
                                 | |
| 3 | 6 | 
                                    
                                    15.8%
                                 | |
| 5 | 6 | 
                                    
                                    15.8%
                                 | |
| 6 | 1 | 
                                    
                                    2.6%
                                 | |
| 7 | 4 | 
                                    
                                    10.5%
                                 | |
| 8 | 5 | 
                                    
                                    13.2%
                                 | |
| 9 | 9 | 
                                    
                                    23.7%
                                 | |
| 10 | Very effective | 1 | 
                                    
                                    2.6%
                                 | 
| 11 | Don't know | 71 | |
| Sysmiss | 34 |