| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 213 | 
                                                                 
                                    
                                    36.7%
                                 
                                                             | 
                                                        
                    
| 2 | No | 359 | 
                                                                 
                                    
                                    61.9%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1 |