| Value | Category | Cases | |
|---|---|---|---|
| -99 | 2 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 1 | Not effective at all | 2 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    
| 2 | 2 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 3 | 4 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 4 | 7 | 
                                                                 
                                    
                                    3.2%
                                 
                                                             | 
                                                        
                    |
| 5 | 24 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    |
| 6 | 15 | 
                                                                 
                                    
                                    6.9%
                                 
                                                             | 
                                                        
                    |
| 7 | 27 | 
                                                                 
                                    
                                    12.5%
                                 
                                                             | 
                                                        
                    |
| 8 | 29 | 
                                                                 
                                    
                                    13.4%
                                 
                                                             | 
                                                        
                    |
| 9 | 16 | 
                                                                 
                                    
                                    7.4%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 16 | 
                                                                 
                                    
                                    7.4%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 72 | 
                                                                 
                                    
                                    33.3%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 4 |