| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Very effective | 471 | 
                                    
                                    39.3%
                                 | 
| 1 | Effective | 574 | 
                                    
                                    47.8%
                                 | 
| 2 | Not very effective | 107 | 
                                    
                                    8.9%
                                 | 
| 3 | Not at all effective | 35 | 
                                    
                                    2.9%
                                 | 
| 9 | Don't Know | 13 | 
                                    
                                    1.1%
                                 | 
| 98 | Refused | 0 | 
                                    
                                    0%
                                 |