| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 4334 | 
                                                                 
                                    
                                    75%
                                 
                                                             | 
                                                        
                    
| 1 | Mild | 1133 | 
                                                                 
                                    
                                    19.6%
                                 
                                                             | 
                                                        
                    
| 2 | Moderate | 227 | 
                                                                 
                                    
                                    3.9%
                                 
                                                             | 
                                                        
                    
| 3 | Severe | 77 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    
| 4 | Extreme or can't do | 4 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             |