| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 9 | 
                                    
                                    3.1%
                                 | 
| 2 | 10 | 
                                    
                                    3.4%
                                 | |
| 3 | 21 | 
                                    
                                    7.2%
                                 | |
| 4 | 23 | 
                                    
                                    7.8%
                                 | |
| 5 | 47 | 
                                    
                                    16%
                                 | |
| 6 | 29 | 
                                    
                                    9.9%
                                 | |
| 7 | 19 | 
                                    
                                    6.5%
                                 | |
| 8 | 14 | 
                                    
                                    4.8%
                                 | |
| 9 | 4 | 
                                    
                                    1.4%
                                 | |
| 10 | Very effective | 4 | 
                                    
                                    1.4%
                                 | 
| 11 | Don't know | 113 | 
                                    
                                    38.6%
                                 | 
| Sysmiss | 8 |