| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 5 | 
                                    
                                    1.7%
                                 | 
| 2 | 18 | 
                                    
                                    6.1%
                                 | |
| 3 | 22 | 
                                    
                                    7.5%
                                 | |
| 4 | 24 | 
                                    
                                    8.2%
                                 | |
| 5 | 50 | 
                                    
                                    17%
                                 | |
| 6 | 25 | 
                                    
                                    8.5%
                                 | |
| 7 | 25 | 
                                    
                                    8.5%
                                 | |
| 8 | 10 | 
                                    
                                    3.4%
                                 | |
| 9 | 4 | 
                                    
                                    1.4%
                                 | |
| 10 | Very effective | 8 | 
                                    
                                    2.7%
                                 | 
| 11 | Don't know | 103 | 
                                    
                                    35%
                                 | 
| Sysmiss | 7 |