| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 0 | 145 | 
                                    
                                    96.7%
                                 | |
| 10 | 2 | 
                                    
                                    1.3%
                                 | |
| 20 | 2 | 
                                    
                                    1.3%
                                 | |
| 40 | 1 | 
                                    
                                    0.7%
                                 |