| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 36 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    
| 2 | Mild | 128 | 
                                                                 
                                    
                                    6.6%
                                 
                                                             | 
                                                        
                    
| 3 | Moderate | 484 | 
                                                                 
                                    
                                    24.8%
                                 
                                                             | 
                                                        
                    
| 4 | Severe | 977 | 
                                                                 
                                    
                                    50.1%
                                 
                                                             | 
                                                        
                    
| 5 | Extreme | 325 | 
                                                                 
                                    
                                    16.7%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1988 |