| Value | Category | Cases | |
|---|---|---|---|
| 1 | 0 | 1 | 
                                    
                                    0%
                                 | 
| 2 | O2 | 628 | 
                                    
                                    19.7%
                                 | 
| Missing value | 2554 | 
                                    
                                    80.2%
                                 |