| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 | 
                                    
                                    1%
                                 | 
| 2 | 5 | 
                                    
                                    4.8%
                                 | |
| 3 | 7 | 
                                    
                                    6.7%
                                 | |
| 4 | 6 | 
                                    
                                    5.8%
                                 | |
| 5 | 10 | 
                                    
                                    9.6%
                                 | |
| 6 | 12 | 
                                    
                                    11.5%
                                 | |
| 7 | 14 | 
                                    
                                    13.5%
                                 | |
| 8 | 7 | 
                                    
                                    6.7%
                                 | |
| 9 | 3 | 
                                    
                                    2.9%
                                 | |
| 10 | Very effective | 2 | 
                                    
                                    1.9%
                                 | 
| 11 | Don't know | 37 | 
                                    
                                    35.6%
                                 | 
| Sysmiss | 8 |