| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | Not at all effective | 82 | 
                                    
                                    6.8%
                                 | 
| 1 | Not very effective | 296 | 
                                    
                                    24.7%
                                 | 
| 2 | Somewhat effective | 338 | 
                                    
                                    28.2%
                                 | 
| 3 | Very effective | 334 | 
                                    
                                    27.8%
                                 | 
| 9 | Don't know | 150 | 
                                    
                                    12.5%
                                 | 
| 98 | Refused | 0 | 
                                    
                                    0%
                                 |