| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 0 | No | 1080 | 
                                    
                                    90%
                                 | 
| 1 | Yes | 120 | 
                                    
                                    10%
                                 | 
| 9 | Can't determine | 0 | 
                                    
                                    0%
                                 |