| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 6 | 
                                    
                                    12.2%
                                 | 
| 2 | 4 | 
                                    
                                    8.2%
                                 | |
| 3 | 3 | 
                                    
                                    6.1%
                                 | |
| 4 | 2 | 
                                    
                                    4.1%
                                 | |
| 5 | 9 | 
                                    
                                    18.4%
                                 | |
| 6 | 3 | 
                                    
                                    6.1%
                                 | |
| 7 | 9 | 
                                    
                                    18.4%
                                 | |
| 8 | 9 | 
                                    
                                    18.4%
                                 | |
| 9 | 3 | 
                                    
                                    6.1%
                                 | |
| 10 | Very effective | 1 | 
                                    
                                    2%
                                 | 
| 11 | Don't know | 60 | |
| Sysmiss | 34 |