| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 | 
                                    
                                    1%
                                 | 
| 2 | 12 | 
                                    
                                    4.1%
                                 | |
| 3 | 15 | 
                                    
                                    5.1%
                                 | |
| 4 | 17 | 
                                    
                                    5.8%
                                 | |
| 5 | 45 | 
                                    
                                    15.4%
                                 | |
| 6 | 17 | 
                                    
                                    5.8%
                                 | |
| 7 | 28 | 
                                    
                                    9.6%
                                 | |
| 8 | 18 | 
                                    
                                    6.1%
                                 | |
| 9 | 8 | 
                                    
                                    2.7%
                                 | |
| 10 | Very effective | 5 | 
                                    
                                    1.7%
                                 | 
| 11 | Don't know | 125 | 
                                    
                                    42.7%
                                 | 
| Sysmiss | 8 |