| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 4 | 
                                    
                                    9.8%
                                 | 
| 2 | 7 | 
                                    
                                    17.1%
                                 | |
| 3 | 4 | 
                                    
                                    9.8%
                                 | |
| 5 | 3 | 
                                    
                                    7.3%
                                 | |
| 6 | 5 | 
                                    
                                    12.2%
                                 | |
| 7 | 3 | 
                                    
                                    7.3%
                                 | |
| 8 | 6 | 
                                    
                                    14.6%
                                 | |
| 9 | 8 | 
                                    
                                    19.5%
                                 | |
| 10 | Very effective | 1 | 
                                    
                                    2.4%
                                 | 
| 11 | Don't know | 68 | |
| Sysmiss | 34 |