| Value | Category | Cases | |
|---|---|---|---|
| -99 | 3 | 
                                    
                                    1%
                                 | |
| 1 | Not effective at all | 20 | 
                                    
                                    6.7%
                                 | 
| 2 | 13 | 
                                    
                                    4.4%
                                 | |
| 3 | 18 | 
                                    
                                    6%
                                 | |
| 4 | 19 | 
                                    
                                    6.4%
                                 | |
| 5 | 23 | 
                                    
                                    7.7%
                                 | |
| 6 | 16 | 
                                    
                                    5.4%
                                 | |
| 7 | 26 | 
                                    
                                    8.7%
                                 | |
| 8 | 25 | 
                                    
                                    8.4%
                                 | |
| 9 | 12 | 
                                    
                                    4%
                                 | |
| 10 | Very effective | 25 | 
                                    
                                    8.4%
                                 | 
| 11 | Don't know | 98 | 
                                    
                                    32.9%
                                 | 
| Sysmiss | 28 |