| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 | 
                                    
                                    6.3%
                                 | 
| 1 | Yes | 12 | 
                                    
                                    10.8%
                                 | 
| 2 | No | 92 | 
                                    
                                    82.9%
                                 |