| Value | Category | Cases | |
|---|---|---|---|
| -99 | 11 | 
                                    
                                    3.7%
                                 | |
| 1 | Not effective at all | 15 | 
                                    
                                    5%
                                 | 
| 2 | 12 | 
                                    
                                    4%
                                 | |
| 3 | 19 | 
                                    
                                    6.3%
                                 | |
| 4 | 27 | 
                                    
                                    9%
                                 | |
| 5 | 24 | 
                                    
                                    8%
                                 | |
| 6 | 15 | 
                                    
                                    5%
                                 | |
| 7 | 22 | 
                                    
                                    7.3%
                                 | |
| 8 | 12 | 
                                    
                                    4%
                                 | |
| 9 | 16 | 
                                    
                                    5.3%
                                 | |
| 10 | Very effective | 17 | 
                                    
                                    5.6%
                                 | 
| 11 | Don't know | 111 | 
                                    
                                    36.9%
                                 | 
| Sysmiss | 25 |