| Value | Category | 
                                    
                    
                        | -2147483648 | Don't know | 
                                    
                    
                        | -98 | (DON'T READ): Refuse to answer | 
                                    
                    
                        | 0 | Not at all or less than 1 day | 
                                    
                    
                        | 1 | 1-2 days | 
                                    
                    
                        | 2 | 3-4 days | 
                                    
                    
                        | 3 | 5-7 days | 
                                    
                    
                        | 11 | .. | 
                            
            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.