Use of laboratory tests and pharmaceuticals. Variation among physicians and effect of cost audit on subsequent use.
D000368:Aged; D000553:Ambulatory Care; D019411:Clinical Laboratory Techniques; D003365:Costs and Cost Analysis; D004219:District of Columbia; D004358:Drug Therapy / Q000706:statistics & numerical data*; D005260:Female; D006760:Hospitalization; D006784:Hospitals, Teaching; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography / Q000706:statistics & numerical data