| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 16 | 
                                                                 
                                    
                                    4.5%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 255 | 
                                                                 
                                    
                                    71.4%
                                 
                                                             | 
                                                        
                    
| 2 | No | 86 | 
                                                                 
                                    
                                    24.1%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 415 |