| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 4 | 
                                    
                                    1.4%
                                 | 
| 2 | 8 | 
                                    
                                    2.7%
                                 | |
| 3 | 11 | 
                                    
                                    3.7%
                                 | |
| 4 | 20 | 
                                    
                                    6.8%
                                 | |
| 5 | 44 | 
                                    
                                    14.9%
                                 | |
| 6 | 37 | 
                                    
                                    12.5%
                                 | |
| 7 | 35 | 
                                    
                                    11.8%
                                 | |
| 8 | 19 | 
                                    
                                    6.4%
                                 | |
| 9 | 15 | 
                                    
                                    5.1%
                                 | |
| 10 | Very effective | 8 | 
                                    
                                    2.7%
                                 | 
| 11 | Don't know | 95 | 
                                    
                                    32.1%
                                 | 
| Sysmiss | 5 |