| Value | Category | Cases | |
|---|---|---|---|
| -99 | 8 | 
                                    
                                    2.1%
                                 | |
| 1 | Not effective at all | 2 | 
                                    
                                    0.5%
                                 | 
| 2 | 3 | 
                                    
                                    0.8%
                                 | |
| 3 | 5 | 
                                    
                                    1.3%
                                 | |
| 4 | 2 | 
                                    
                                    0.5%
                                 | |
| 5 | 16 | 
                                    
                                    4.2%
                                 | |
| 6 | 29 | 
                                    
                                    7.6%
                                 | |
| 7 | 57 | 
                                    
                                    15%
                                 | |
| 8 | 84 | 
                                    
                                    22.1%
                                 | |
| 9 | 46 | 
                                    
                                    12.1%
                                 | |
| 10 | Very effective | 29 | 
                                    
                                    7.6%
                                 | 
| 11 | Don't know | 99 | 
                                    
                                    26.1%
                                 | 
| Sysmiss | 49 |