| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 7905 | 
                                    
                                    95.9%
                                 | 
| 1 | yes | 268 | 
                                    
                                    3.3%
                                 | 
| 8 | don't know | 64 | 
                                    
                                    0.8%
                                 | 
| 9 | 2 | 
                                    
                                    0%
                                 |