| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 | 
                                    
                                    8.2%
                                 | 
| 1 | Yes | 31 | 
                                    
                                    32%
                                 | 
| 2 | No | 58 | 
                                    
                                    59.8%
                                 |