| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 4 | 1 | 
                                                                 
                                    
                                    100%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 113 |