| Value | Category | Cases | |
|---|---|---|---|
| -99 | -99 | 0 | 
                                    
                                    0%
                                 | 
| 0 | 0 | 448 | 
                                    
                                    49.3%
                                 | 
| 1 | 1 | 460 | 
                                    
                                    50.7%
                                 | 
| Sysmiss | 30 |