| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 48 | 
                                    
                                    0.2%
                                 | 
| 0 | No | 12572 | 
                                    
                                    49.5%
                                 | 
| 1 | Yes | 12672 | 
                                    
                                    49.9%
                                 | 
| 9 | Don't know | 105 | 
                                    
                                    0.4%
                                 | 
| 998 | Refused | 0 | 
                                    
                                    0%
                                 |