| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 | 
                                                                 
                                    
                                    6.8%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 60 | 
                                                                 
                                    
                                    81.1%
                                 
                                                             | 
                                                        
                    
| 2 | No | 9 | 
                                                                 
                                    
                                    12.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 314 |