| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    
| 0 | 274 | 
                                                                 
                                    
                                    73.1%
                                 
                                                             | 
                                                        
                    |
| 1 | 16 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    |
| 2 | 28 | 
                                                                 
                                    
                                    7.5%
                                 
                                                             | 
                                                        
                    |
| 3 | 10 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    |
| 4 | 10 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    |
| 5 | 7 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 6 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 7 | 2 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 10 | 6 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| 12 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 13 | 2 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 14 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 15 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 19 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 20 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 25 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 30 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 40 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             |