| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    
| 0 | 172 | 
                                                                 
                                    
                                    73.8%
                                 
                                                             | 
                                                        
                    |
| 1 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 2 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 3 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 5 | 7 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 10 | 16 | 
                                                                 
                                    
                                    6.9%
                                 
                                                             | 
                                                        
                    |
| 20 | 8 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 30 | 12 | 
                                                                 
                                    
                                    5.2%
                                 
                                                             | 
                                                        
                    |
| 35 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 40 | 2 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 50 | 3 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    |
| 60 | 2 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 65 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 75 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             |