| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 16 | 
                                                                 
                                    
                                    45.7%
                                 
                                                             | 
                                                        
                    
| 2 | No | 19 | 
                                                                 
                                    
                                    54.3%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 329 |