| Value | Category | Cases | |
|---|---|---|---|
| 0 | 53 | 
                                    
                                    1.5%
                                 | |
| 1 | 122 | 
                                    
                                    3.4%
                                 | |
| Missing value | 3450 | 
                                    
                                    95.2%
                                 |