| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 7 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    
| 2 | Mild | 11 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    
| 3 | Moderate | 40 | 
                                                                 
                                    
                                    4.1%
                                 
                                                             | 
                                                        
                    
| 4 | Severe | 475 | 
                                                                 
                                    
                                    48.4%
                                 
                                                             | 
                                                        
                    
| 5 | Extreme | 449 | 
                                                                 
                                    
                                    45.7%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 2956 |