| Value | Category | Cases | |
|---|---|---|---|
| -99 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | 0 | 971 | 
                                    
                                    81.1%
                                 | 
| 1 | 1 | 227 | 
                                    
                                    18.9%
                                 | 
| Sysmiss | 2 |