Effect of aspirin on postoperative venous thrombosis. Report of the Steering Committee of a trial sponsored by the Medical Research Council.

Adult Age Factors Aspirin/administration & dosage,pharmacology,therapeutic use,urine Blood Group Antigens Blood Platelets/drug effects Clinical Trials as Topic Female Fibrinogen/metabolism Hemostasis Humans Iodine Radioisotopes Male Methods Middle Aged Placebos Postoperative Complications/prevention & control Sex Factors Thrombophlebitis/diagnosis,prevention & control Time Factors

Blood Group Antigens Iodine Radioisotopes Placebos Fibrinogen Aspirin