| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    0.3%
                                 | 
| 1 | Yes | 110 | 
                                    
                                    30.3%
                                 | 
| 2 | No | 252 | 
                                    
                                    69.4%
                                 |