| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very effective | 419 | 
                                    
                                    17.2%
                                 | 
| 2 | Fairly effective | 717 | 
                                    
                                    29.4%
                                 | 
| 3 | Fairly ineffective | 648 | 
                                    
                                    26.5%
                                 | 
| 4 | Very ineffective | 657 | 
                                    
                                    26.9%
                                 | 
| Sysmiss | 1109 |