| Value | Category | 
                                    
                    
                        | 1 | (DON'T READ): Refuse to answer | 
                                    
                    
                        | 2 | Not at all or less than 1 day | 
                                    
                    
                        | 3 | 1-2 days | 
                                    
                    
                        | 4 | 3-4 days | 
                                    
                    
                        | 5 | 5-7 days | 
                            
            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.