| 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.