| Value | Category | Cases | |
|---|---|---|---|
| 0 | 69 | 
                                    
                                    1.9%
                                 | |
| 1 | 496 | 
                                    
                                    13.7%
                                 | |
| Missing value | 3060 | 
                                    
                                    84.4%
                                 |