| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 | 
                                    
                                    3.3%
                                 | 
| 2 | 4 | 
                                    
                                    6.6%
                                 | |
| 3 | 4 | 
                                    
                                    6.6%
                                 | |
| 4 | 4 | 
                                    
                                    6.6%
                                 | |
| 5 | 7 | 
                                    
                                    11.5%
                                 | |
| 6 | 7 | 
                                    
                                    11.5%
                                 | |
| 7 | 10 | 
                                    
                                    16.4%
                                 | |
| 8 | 12 | 
                                    
                                    19.7%
                                 | |
| 9 | 9 | 
                                    
                                    14.8%
                                 | |
| 10 | Very effective | 2 | 
                                    
                                    3.3%
                                 | 
| 11 | N/A | 62 | |
| Sysmiss | 20 |