| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 6 | 
                                    
                                    2%
                                 | 
| 2 | 6 | 
                                    
                                    2%
                                 | |
| 3 | 5 | 
                                    
                                    1.7%
                                 | |
| 4 | 11 | 
                                    
                                    3.7%
                                 | |
| 5 | 69 | 
                                    
                                    23.4%
                                 | |
| 6 | 57 | 
                                    
                                    19.3%
                                 | |
| 7 | 43 | 
                                    
                                    14.6%
                                 | |
| 8 | 28 | 
                                    
                                    9.5%
                                 | |
| 9 | 19 | 
                                    
                                    6.4%
                                 | |
| 10 | Very effective | 15 | 
                                    
                                    5.1%
                                 | 
| 11 | Don't know | 36 | 
                                    
                                    12.2%
                                 | 
| Sysmiss | 6 |