| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 4 | 
                                    
                                    0.4%
                                 | 
| 2 | Mild | 12 | 
                                    
                                    1.2%
                                 | 
| 3 | Moderate | 41 | 
                                    
                                    4.2%
                                 | 
| 4 | Severe | 467 | 
                                    
                                    47.6%
                                 | 
| 5 | Extreme | 457 | 
                                    
                                    46.6%
                                 | 
| Sysmiss | 2957 |