| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 6 | 
                                    
                                    2.1%
                                 | 
| 2 | 7 | 
                                    
                                    2.4%
                                 | |
| 3 | 7 | 
                                    
                                    2.4%
                                 | |
| 4 | 16 | 
                                    
                                    5.5%
                                 | |
| 5 | 59 | 
                                    
                                    20.3%
                                 | |
| 6 | 32 | 
                                    
                                    11%
                                 | |
| 7 | 19 | 
                                    
                                    6.5%
                                 | |
| 8 | 10 | 
                                    
                                    3.4%
                                 | |
| 9 | 4 | 
                                    
                                    1.4%
                                 | |
| 10 | Very effective | 3 | 
                                    
                                    1%
                                 | 
| 11 | Don't know | 128 | 
                                    
                                    44%
                                 | 
| Sysmiss | 10 |