| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 4113 | 
                                                         
                                
                                99.7%
                                                             
                                                     | 
                                            
| 1 | Yes | 10 | 
                                                         
                                
                                0.2%
                                                             
                                                     | 
                                            
| 9 | 1 | 
                                                         
                                
                                0%
                                                             
                                                     | 
                                            |
| Sysmiss | 1992 |