| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | 361 | 
                                    
                                    99.4%
                                 | |
| 30 | 2 | 
                                    
                                    0.6%
                                 |