| Value | Category | 
                                    
                    
                        | 1 | 01. Never | 
                                    
                    
                        | 2 | 02. 1/day | 
                                    
                    
                        | 3 | 03. 2-3/wk | 
                                    
                    
                        | 4 | 04. 1/week | 
                                    
                    
                        | 5 | 05. 2-3/mth | 
                                    
                    
                        | 6 | 06. 1/mth | 
                                    
                    
                        | 7 | 07. Other | 
                                    
                    
                        | 99 | 99. Miss | 
                                    
                    
                        | 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.