| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 1490 | 
                                    
                                    18.4%
                                 | 
| 1 | yes | 5585 | 
                                    
                                    68.8%
                                 | 
| 8 | dk | 1036 | 
                                    
                                    12.8%
                                 | 
| 9 | 2 | 
                                    
                                    0%
                                 | |
| 11 | .Z | 126 |