| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 | 
                                    
                                    0.8%
                                 | 
| 1 | Yes | 275 | 
                                    
                                    42.6%
                                 | 
| 2 | No | 365 | 
                                    
                                    56.6%
                                 |