1. From the NHLBI Jackson Heart Study (E.R.F., H.A.T., T.N.S.), Mississippi; the University of Mississippi Medical Center (E.R.F., H.A.T., E.M.Q., T.N.S.), Jackson; the NHLBI FHS (E.J.B.), Massachusetts; Boston University School of Medicine (E.J.B.), Massachusetts; John Hopkins School of Public Health (J.D.), Baltimore, Md; Rush University Medical Center (P.R.L.), Chicago, Ill; and the University of Minnesota (D.A.), Minneapolis, Minn.