| Value | Category | Cases | |
|---|---|---|---|
| -9 | DON'T KNOW (SPONTANEOUS) | 12 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 116 | 
                                                                 
                                    
                                    11.3%
                                 
                                                             | 
                                                        
                    
| 2 | No | 902 | 
                                                                 
                                    
                                    87.6%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 2 |