| Value | Category | Cases | |
|---|---|---|---|
| 1 | less than six weeks | 2740 | 
                                                                 
                                    
                                    76.7%
                                 
                                                             | 
                                                        
                    
| 2 | six weeks or more | 719 | 
                                                                 
                                    
                                    20.1%
                                 
                                                             | 
                                                        
                    
| 8 | DK | 114 | 
                                                                 
                                    
                                    3.2%
                                 
                                                             |