| Value | Category | Cases | |
|---|---|---|---|
| 0 | 27 | 
                                    
                                    2.1%
                                 | |
| 1 | 4 | 
                                    
                                    0.3%
                                 | |
| Missing value | 1255 | 
                                    
                                    97.6%
                                 |