| Value | Category | Cases | |
|---|---|---|---|
| 0 | 21 | 
                                    
                                    1.6%
                                 | |
| 1 | 10 | 
                                    
                                    0.8%
                                 | |
| Missing value | 1255 | 
                                    
                                    97.6%
                                 |