| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 4 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    
| 2 | No | 32 | 
                                                                 
                                    
                                    88.9%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 173 |