| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 501 | 
                                                                 
                                    
                                    96.9%
                                 
                                                             | 
                                                        
                    
| 1 | Yes(address recorded) | 15 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    
| 999 | Do not know(or does not apply) | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 236 |