| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 975 | 
                                    
                                    15.5%
                                 | 
| 2 | no | 5297 | 
                                    
                                    84.3%
                                 | 
| 8 | dk | 14 | 
                                    
                                    0.2%
                                 | 
| Sysmiss | 9065 |