| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 36 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    
| 2 | Mild | 150 | 
                                                                 
                                    
                                    7.7%
                                 
                                                             | 
                                                        
                    
| 3 | Moderate | 496 | 
                                                                 
                                    
                                    25.4%
                                 
                                                             | 
                                                        
                    
| 4 | Severe | 855 | 
                                                                 
                                    
                                    43.8%
                                 
                                                             | 
                                                        
                    
| 5 | Extreme | 413 | 
                                                                 
                                    
                                    21.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1988 |