| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 6 | 
                                    
                                    2%
                                 | 
| 2 | 18 | 
                                    
                                    6.1%
                                 | |
| 3 | 25 | 
                                    
                                    8.5%
                                 | |
| 4 | 21 | 
                                    
                                    7.1%
                                 | |
| 5 | 43 | 
                                    
                                    14.6%
                                 | |
| 6 | 30 | 
                                    
                                    10.2%
                                 | |
| 7 | 23 | 
                                    
                                    7.8%
                                 | |
| 8 | 12 | 
                                    
                                    4.1%
                                 | |
| 9 | 8 | 
                                    
                                    2.7%
                                 | |
| 10 | Very effective | 9 | 
                                    
                                    3.1%
                                 | 
| 11 | Don't know | 99 | 
                                    
                                    33.7%
                                 | 
| Sysmiss | 7 |