| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 | 
                                    
                                    6.3%
                                 | 
| 1 | Yes | 20 | 
                                    
                                    18%
                                 | 
| 2 | No | 84 | 
                                    
                                    75.7%
                                 |