| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 20 | 
                                    
                                    1.4%
                                 | 
| 1 | Yes | 802 | 
                                    
                                    56.6%
                                 | 
| 2 | No | 594 | 
                                    
                                    41.9%
                                 |