| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 156 | 
                                    
                                    8.6%
                                 | 
| 1 | Yes | 1620 | 
                                    
                                    89%
                                 | 
| 999 | Refused/Skipped | 45 | 
                                    
                                    2.5%
                                 | 
| Sysmiss | 1 |