| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 24 | 
                                    
                                    24.7%
                                 | 
| 1 | Yes | 20 | 
                                    
                                    20.6%
                                 | 
| 2 | No | 53 | 
                                    
                                    54.6%
                                 |