| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 | 
                                    
                                    1.2%
                                 | 
| 1 | Yes | 279 | 
                                    
                                    43.3%
                                 | 
| 2 | No | 358 | 
                                    
                                    55.5%
                                 |