| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 | 
                                    
                                    0.5%
                                 | 
| -7 | Does not apply | 0 | 
                                    
                                    0%
                                 | 
| 1 | Yes | 287 | 
                                    
                                    46.9%
                                 | 
| 2 | No | 322 | 
                                    
                                    52.6%
                                 |