| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 37 | 
                                                                 
                                    
                                    25.5%
                                 
                                                             | 
                                                        
                    
| 0 | 84 | 
                                                                 
                                    
                                    57.9%
                                 
                                                             | 
                                                        
                    |
| 1 | 1 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 5 | 2 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 8 | 1 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 10 | 5 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 15 | 3 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 20 | 5 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 50 | 5 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 70 | 1 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 80 | 1 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             |