| Value | Category | Cases | |
|---|---|---|---|
| 1 | O1 | 3 | 
                                    
                                    0.1%
                                 | 
| 2 | O2 | 2551 | 
                                    
                                    80.1%
                                 | 
| Missing value | 629 | 
                                    
                                    19.8%
                                 |