| Value | Category | 
                                    
                    
                        | 1 | Less than one week | 
                                    
                    
                        | 2 | 1-2 weeks | 
                                    
                    
                        | 3 | 3-4 weeks | 
                                    
                    
                        | 4 | One month or more | 
                                    
                    
                        | 5 | Not yet healed | 
                                    
                    
                        | Sysmiss |  | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.