| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 46 | 
                                    
                                    2.5%
                                 | 
| 1 | Yes | 1754 | 
                                    
                                    96.3%
                                 | 
| 999 | Refused/Skipped | 21 | 
                                    
                                    1.2%
                                 | 
| Sysmiss | 1 |