| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 160 | 
                                                                 
                                    
                                    43.6%
                                 
                                                             | 
                                                        
                    
| 1 | 75 | 
                                                                 
                                    
                                    20.4%
                                 
                                                             | 
                                                        
                    |
| 2 | 98 | 
                                                                 
                                    
                                    26.7%
                                 
                                                             | 
                                                        
                    |
| 3 | 18 | 
                                                                 
                                    
                                    4.9%
                                 
                                                             | 
                                                        
                    |
| 4 | 4 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 5 | 10 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    |
| 7 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 10 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 21 |