| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 | 
                                    
                                    1%
                                 | 
| 2 | 4 | 
                                    
                                    1.4%
                                 | |
| 3 | 6 | 
                                    
                                    2%
                                 | |
| 4 | 22 | 
                                    
                                    7.5%
                                 | |
| 5 | 54 | 
                                    
                                    18.3%
                                 | |
| 6 | 29 | 
                                    
                                    9.8%
                                 | |
| 7 | 26 | 
                                    
                                    8.8%
                                 | |
| 8 | 26 | 
                                    
                                    8.8%
                                 | |
| 9 | 15 | 
                                    
                                    5.1%
                                 | |
| 10 | Very effective | 8 | 
                                    
                                    2.7%
                                 | 
| 11 | Don't know | 102 | 
                                    
                                    34.6%
                                 | 
| Sysmiss | 6 |