| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 223 | 
                                    
                                    12.2%
                                 | 
| 1 | Yes | 1600 | 
                                    
                                    87.7%
                                 | 
| 99 | Don't know | 2 | 
                                    
                                    0.1%
                                 |