| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                    
                                    1.1%
                                 | 
| 1 | Yes | 40 | 
                                    
                                    11%
                                 | 
| 2 | No | 319 | 
                                    
                                    87.9%
                                 |