| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    
| 0 | 43 | 
                                                                 
                                    
                                    44.8%
                                 
                                                             | 
                                                        
                    |
| 1 | 15 | 
                                                                 
                                    
                                    15.6%
                                 
                                                             | 
                                                        
                    |
| 2 | 12 | 
                                                                 
                                    
                                    12.5%
                                 
                                                             | 
                                                        
                    |
| 3 | 10 | 
                                                                 
                                    
                                    10.4%
                                 
                                                             | 
                                                        
                    |
| 4 | 4 | 
                                                                 
                                    
                                    4.2%
                                 
                                                             | 
                                                        
                    |
| 5 | 2 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 6 | 2 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 7 | 2 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 13 | 1 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 15 | 1 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 25 | 2 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 137 |