| Value | Category | 
                                    
                    
                        | 1 | TWICE OR MORE PER MONTH | 
                                    
                    
                        | 2 | MONTHLY | 
                                    
                    
                        | 3 | QUARTERLY | 
                                    
                    
                        | 4 | SEMI-ANNUALLY | 
                                    
                    
                        | 5 | ANNUALLY | 
                                    
                    
                        | 6 | SPORADICALLY AS NEEDED | 
                                    
                    
                        | 7 | OTHER (SPECIFY) | 
                                    
                    
                        | 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.