| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    0.3%
                                 | 
| 1 | Yes | 384 | 
                                    
                                    62.7%
                                 | 
| 2 | No | 226 | 
                                    
                                    36.9%
                                 |