| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    0.2%
                                 | 
| 1 | Yes | 53 | 
                                    
                                    5.2%
                                 | 
| 2 | No | 969 | 
                                    
                                    94.6%
                                 |