| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 | 
                                    
                                    0.8%
                                 | 
| 2 | 4 | 
                                    
                                    3.1%
                                 | |
| 3 | 8 | 
                                    
                                    6.3%
                                 | |
| 4 | 9 | 
                                    
                                    7%
                                 | |
| 5 | 13 | 
                                    
                                    10.2%
                                 | |
| 6 | 24 | 
                                    
                                    18.8%
                                 | |
| 7 | 21 | 
                                    
                                    16.4%
                                 | |
| 8 | 30 | 
                                    
                                    23.4%
                                 | |
| 9 | 11 | 
                                    
                                    8.6%
                                 | |
| 10 | Very effective | 7 | 
                                    
                                    5.5%
                                 | 
| -99 | 1 | ||
| 11 | Don't know | 16 | |
| Sysmiss | 14 |