| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 1155 | 
                                    
                                    14%
                                 | 
| 1 | yes | 6798 | 
                                    
                                    82.5%
                                 | 
| 8 | dk | 282 | 
                                    
                                    3.4%
                                 | 
| 9 | 4 | 
                                    
                                    0%
                                 |