| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 204 | 
                                                                 
                                    
                                    10.4%
                                 
                                                             | 
                                                        
                    
| 2 | Mild | 374 | 
                                                                 
                                    
                                    19.1%
                                 
                                                             | 
                                                        
                    
| 3 | Moderate | 649 | 
                                                                 
                                    
                                    33.1%
                                 
                                                             | 
                                                        
                    
| 4 | Severe | 643 | 
                                                                 
                                    
                                    32.8%
                                 
                                                             | 
                                                        
                    
| 5 | Extreme | 92 | 
                                                                 
                                    
                                    4.7%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1976 |