| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 1294 | 
                                    
                                    22.1%
                                 | 
| 2 | no | 4544 | 
                                    
                                    77.7%
                                 | 
| 8 | dk | 11 | 
                                    
                                    0.2%
                                 | 
| Sysmiss | 9502 |