| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 26 | 
                                    
                                    7.2%
                                 | 
| 1 | Yes | 172 | 
                                    
                                    47.4%
                                 | 
| 2 | No | 165 | 
                                    
                                    45.5%
                                 |