| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 4566 | 
                                                                 
                                    
                                    79.1%
                                 
                                                             | 
                                                        
                    
| 1 | Mild | 997 | 
                                                                 
                                    
                                    17.3%
                                 
                                                             | 
                                                        
                    
| 2 | Moderate | 187 | 
                                                                 
                                    
                                    3.2%
                                 
                                                             | 
                                                        
                    
| 3 | Severe | 17 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| 4 | Extreme or can't do | 8 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             |