| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 4369 | 
                                    
                                    91.1%
                                 | 
| 1 | yes | 408 | 
                                    
                                    8.5%
                                 | 
| 8 | unsure | 10 | 
                                    
                                    0.2%
                                 | 
| 9 | 7 | 
                                    
                                    0.1%
                                 | |
| 11 | .Z | 3445 |