| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 | 
                                    
                                    2.2%
                                 | 
| 1 | Yes | 386 | 
                                    
                                    64.3%
                                 | 
| 2 | No | 201 | 
                                    
                                    33.5%
                                 |