| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1069 | 
                                                                 
                                    
                                    19.8%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 1988 | 
                                                                 
                                    
                                    36.9%
                                 
                                                             | 
                                                        
                    
| 2 | No | 2331 | 
                                                                 
                                    
                                    43.3%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 5284 |