| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 5 | 
                                    
                                    2.6%
                                 | 
| 3 | 12 | 
                                    
                                    6.1%
                                 | |
| 4 | 13 | 
                                    
                                    6.6%
                                 | |
| 5 | 20 | 
                                    
                                    10.2%
                                 | |
| 6 | 22 | 
                                    
                                    11.2%
                                 | |
| 7 | 35 | 
                                    
                                    17.9%
                                 | |
| 8 | 22 | 
                                    
                                    11.2%
                                 | |
| 9 | 21 | 
                                    
                                    10.7%
                                 | |
| 10 | Very effective | 46 | 
                                    
                                    23.5%
                                 | 
| 11 | Don't know | 69 | |
| Sysmiss | 54 |