| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 41 | 
                                    
                                    2.3%
                                 | 
| 1 | Yes | 1736 | 
                                    
                                    95.3%
                                 | 
| 999 | Refused/Skipped | 44 | 
                                    
                                    2.4%
                                 | 
| Sysmiss | 1 |