| Value | Category | Cases | |
|---|---|---|---|
| 1 | O1 | 40 | 
                                    
                                    32.5%
                                 | 
| 2 | O2 | 4 | 
                                    
                                    3.3%
                                 | 
| 3 | O3 | 28 | 
                                    
                                    22.8%
                                 | 
| 4 | O4 | 0 | 
                                    
                                    0%
                                 | 
| Missing value | 51 | 
                                    
                                    41.5%
                                 |