| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 513 | 
                                    
                                    25.2%
                                 | 
| 2 | no | 1498 | 
                                    
                                    73.5%
                                 | 
| 8 | dk | 26 | 
                                    
                                    1.3%
                                 | 
| Sysmiss | 13314 |