| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 | 
                                                                 
                                    
                                    3.3%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 286 | 
                                                                 
                                    
                                    78.4%
                                 
                                                             | 
                                                        
                    
| 2 | No | 67 | 
                                                                 
                                    
                                    18.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1081 |