| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 766 | 
                                                                 
                                    
                                    14.5%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 2105 | 
                                                                 
                                    
                                    39.8%
                                 
                                                             | 
                                                        
                    
| 2 | No | 2413 | 
                                                                 
                                    
                                    45.7%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 5388 |