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D000367:Age Factors; D000368:Aged; D003625:Data Collection; D004185:Disability Evaluation; D018588:Fee-for-Service Plans / Q000191:economics / Q000706:statistics & numerical data*; D005260:Female; D006279:Health Maintenance Organizations / Q000191:economics / Q000706:statistics & numerical data*; D006304:Health Status; D006801:Humans; D007182:Income / Q000706:statistics & numerical data; D008297:Male; D006278:Medicare / Q000191:economics / Q000706:statistics & numerical data*; D014481:United States