| Value | Category | Cases | |
|---|---|---|---|
| 1 | O1 | 111 | 
                                                                 
                                    
                                    36%
                                 
                                                             | 
                                                        
                    
| 2 | O2 | 55 | 
                                                                 
                                    
                                    17.9%
                                 
                                                             | 
                                                        
                    
| Missing value | 142 | 
                                                                 
                                    
                                    46.1%
                                 
                                                             |