| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 | 
                                    
                                    0.8%
                                 | 
| 0 | 1403 | 
                                    
                                    99.1%
                                 | |
| 50 | 1 | 
                                    
                                    0.1%
                                 |