| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    
| 0 | 16 | 
                                                                 
                                    
                                    22.2%
                                 
                                                             | 
                                                        
                    |
| 1 | 17 | 
                                                                 
                                    
                                    23.6%
                                 
                                                             | 
                                                        
                    |
| 2 | 9 | 
                                                                 
                                    
                                    12.5%
                                 
                                                             | 
                                                        
                    |
| 3 | 4 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 4 | 2 | 
                                                                 
                                    
                                    2.8%
                                 
                                                             | 
                                                        
                    |
| 5 | 3 | 
                                                                 
                                    
                                    4.2%
                                 
                                                             | 
                                                        
                    |
| 6 | 3 | 
                                                                 
                                    
                                    4.2%
                                 
                                                             | 
                                                        
                    |
| 7 | 3 | 
                                                                 
                                    
                                    4.2%
                                 
                                                             | 
                                                        
                    |
| 8 | 1 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 10 | 3 | 
                                                                 
                                    
                                    4.2%
                                 
                                                             | 
                                                        
                    |
| 14 | 1 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 17 | 1 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 20 | 1 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 22 | 2 | 
                                                                 
                                    
                                    2.8%
                                 
                                                             | 
                                                        
                    |
| 23 | 1 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 24 | 1 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 30 | 2 | 
                                                                 
                                    
                                    2.8%
                                 
                                                             | 
                                                        
                    |
| 70 | 1 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 292 |