| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                    
                                    1.9%
                                 | 
| 1 | Yes | 63 | 
                                    
                                    29.3%
                                 | 
| 2 | No | 148 | 
                                    
                                    68.8%
                                 |