| Value | Category | 
                                    
                    
                        | 1 | daily or almost every day | 
                                    
                    
                        | 2 | 3-4 days a week | 
                                    
                    
                        | 3 | 1-2 days a week | 
                                    
                    
                        | 4 | less frequently | 
                                    
                    
                        | 5 | never | 
                                    
                    
                        | 6 | don't know | 
                            
            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.