| Value | Category | 
                                    
                    
                        | 1 | EVERY DAY OR ALMOST EVERY DAY | 
                                    
                    
                        | 2 | ONCE OR TWICE A WEEK | 
                                    
                    
                        | 3 | ONCE OR TWICE A MONTH | 
                                    
                    
                        | 4 | NEVER OR ALMOST NEVER | 
                                    
                    
                        | 9 | OMITTED | 
                                    
                    
                        | 11 | .A | 
                            
            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.