Health ABC is a prospective cohort study of 3,075 nondisabled black (41.7%) and white men and women (51.5%) aged 70–79 years, enrolled from March 1997 to April 1998. Of the 3,075 enrolled, 2815 participants had both a baseline DXA scan and either a follow-up DXA scan (controls, n=2704) or a DXA scan after incident HF (cases. n=111). DXA–Dual X-Ray Absorptiometry. HF–Heart Failure