| Value | Category | Cases | |
|---|---|---|---|
| -99 | 3 | 
                                    
                                    0.5%
                                 | |
| 1 | Not effective at all | 5 | 
                                    
                                    0.8%
                                 | 
| 2 | 5 | 
                                    
                                    0.8%
                                 | |
| 3 | 16 | 
                                    
                                    2.6%
                                 | |
| 4 | 28 | 
                                    
                                    4.5%
                                 | |
| 5 | 93 | 
                                    
                                    15.1%
                                 | |
| 6 | 94 | 
                                    
                                    15.3%
                                 | |
| 7 | 110 | 
                                    
                                    17.9%
                                 | |
| 8 | 88 | 
                                    
                                    14.3%
                                 | |
| 9 | 61 | 
                                    
                                    9.9%
                                 | |
| 10 | Very effective | 38 | 
                                    
                                    6.2%
                                 | 
| 11 | Don't know | 75 | 
                                    
                                    12.2%
                                 | 
| Sysmiss | 8 |