| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 71 | 
                                                                 
                                    
                                    34.8%
                                 
                                                             | 
                                                        
                    
| 0 | 15 | 
                                                                 
                                    
                                    7.4%
                                 
                                                             | 
                                                        
                    |
| 1 | 22 | 
                                                                 
                                    
                                    10.8%
                                 
                                                             | 
                                                        
                    |
| 2 | 39 | 
                                                                 
                                    
                                    19.1%
                                 
                                                             | 
                                                        
                    |
| 3 | 11 | 
                                                                 
                                    
                                    5.4%
                                 
                                                             | 
                                                        
                    |
| 4 | 3 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    |
| 5 | 8 | 
                                                                 
                                    
                                    3.9%
                                 
                                                             | 
                                                        
                    |
| 6 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 7 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 8 | 3 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    |
| 10 | 10 | 
                                                                 
                                    
                                    4.9%
                                 
                                                             | 
                                                        
                    |
| 15 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 20 | 9 | 
                                                                 
                                    
                                    4.4%
                                 
                                                             | 
                                                        
                    |
| 22 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 25 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 30 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 35 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 40 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 42 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 50 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 60 | 1 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 1012 |