| Value | Category | 
                                    
                    
                        | 0 | rarely or never | 
                                    
                    
                        | 1 | at least 2-3 months | 
                                    
                    
                        | 2 | at least once a week | 
                                    
                    
                        | 3 | every day | 
                                    
                    
                        | 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.