| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 1540 | 
                                    
                                    26.4%
                                 | 
| 2 | no | 4217 | 
                                    
                                    72.3%
                                 | 
| 8 | dk | 79 | 
                                    
                                    1.4%
                                 | 
| Sysmiss | 9515 |