| Value | Category | 
                                    
                    
                        | 1 | Less than once a week | 
                                    
                    
                        | 2 | 1 day per week | 
                                    
                    
                        | 3 | 2 days per week | 
                                    
                    
                        | 4 | 3 days per week | 
                                    
                    
                        | 5 | 4 days per week | 
                                    
                    
                        | 6 | 5 or more days per week | 
                                    
                    
                        | 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.