| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 11 | 
                                    
                                    3.5%
                                 | 
| 2 | 7 | 
                                    
                                    2.2%
                                 | |
| 3 | 12 | 
                                    
                                    3.8%
                                 | |
| 4 | 16 | 
                                    
                                    5.1%
                                 | |
| 5 | 27 | 
                                    
                                    8.7%
                                 | |
| 6 | 24 | 
                                    
                                    7.7%
                                 | |
| 7 | 27 | 
                                    
                                    8.7%
                                 | |
| 8 | 19 | 
                                    
                                    6.1%
                                 | |
| 9 | 23 | 
                                    
                                    7.4%
                                 | |
| 10 | Very effective | 93 | 
                                    
                                    29.8%
                                 | 
| 11 | Don't know | 53 | 
                                    
                                    17%
                                 | 
| Sysmiss | 14 |