| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 8 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    
| 2 | Mild | 19 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    
| 3 | Moderate | 70 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    
| 4 | Severe | 617 | 
                                                                 
                                    
                                    31.5%
                                 
                                                             | 
                                                        
                    
| 5 | Extreme | 1245 | 
                                                                 
                                    
                                    63.6%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1979 |