| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 23 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 838 | 
                                                                 
                                    
                                    55.9%
                                 
                                                             | 
                                                        
                    
| 2 | No | 639 | 
                                                                 
                                    
                                    42.6%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 9172 |