| Value | Category | Cases | |
|---|---|---|---|
| -9 | DON'T KNOW (SPONTANEOUS) | 8 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    
| 1 | Yes | 70 | 
                                                                 
                                    
                                    6.8%
                                 
                                                             | 
                                                        
                    
| 2 | No | 952 | 
                                                                 
                                    
                                    92.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 2 |