| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 5 | 
                                    
                                    3%
                                 | 
| 2 | 9 | 
                                    
                                    5.4%
                                 | |
| 3 | 14 | 
                                    
                                    8.4%
                                 | |
| 4 | 15 | 
                                    
                                    9%
                                 | |
| 5 | 19 | 
                                    
                                    11.4%
                                 | |
| 6 | 10 | 
                                    
                                    6%
                                 | |
| 7 | 17 | 
                                    
                                    10.2%
                                 | |
| 8 | 12 | 
                                    
                                    7.2%
                                 | |
| 9 | 11 | 
                                    
                                    6.6%
                                 | |
| 10 | Very effective | 14 | 
                                    
                                    8.4%
                                 | 
| 11 | Don't know | 38 | 
                                    
                                    22.9%
                                 | 
| 12 | Not applicable | 2 | 
                                    
                                    1.2%
                                 | 
| Sysmiss | 41 |