| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 28 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    
| 2 | Mild | 72 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    
| 3 | Moderate | 164 | 
                                                                 
                                    
                                    8.4%
                                 
                                                             | 
                                                        
                    
| 4 | Severe | 780 | 
                                                                 
                                    
                                    39.8%
                                 
                                                             | 
                                                        
                    
| 5 | Extreme | 915 | 
                                                                 
                                    
                                    46.7%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1979 |