| Value | Category | 
                                    
                    
                        | 1 | REGULAR - MORE THAN 6 IN THE YEAR | 
                                    
                    
                        | 2 | REGULAR - LESS THAN 6 IN THE YEAR | 
                                    
                    
                        | 3 | occasional | 
                                    
                    
                        | 4 | ONE TIME | 
                                    
                    
                        | 5 | A MIX OF TYPES | 
                                    
                    
                        | 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.