| Value | Category | Cases | |
|---|---|---|---|
| -99 | 2 | 
                                    
                                    0.3%
                                 | |
| 1 | Not effective at all | 5 | 
                                    
                                    0.8%
                                 | 
| 2 | 15 | 
                                    
                                    2.4%
                                 | |
| 3 | 27 | 
                                    
                                    4.4%
                                 | |
| 4 | 28 | 
                                    
                                    4.6%
                                 | |
| 5 | 77 | 
                                    
                                    12.5%
                                 | |
| 6 | 79 | 
                                    
                                    12.9%
                                 | |
| 7 | 103 | 
                                    
                                    16.8%
                                 | |
| 8 | 98 | 
                                    
                                    16%
                                 | |
| 9 | 54 | 
                                    
                                    8.8%
                                 | |
| 10 | Very effective | 36 | 
                                    
                                    5.9%
                                 | 
| 11 | Don't know | 90 | 
                                    
                                    14.7%
                                 | 
| Sysmiss | 10 |