Table 1. Clinical characteristics of the study population.

	Overall (n = 254)
Age (years)	61.4 + 17
Male	53% (134)
ETHNICITY
White or Caucasian	46% (117)
Black or African American	42.5% (108)
Asian, Pacific Islander, or Indian	5% (12)
Hispanic	5% (13)
Unknown	1.5% (4)
MEDICAL HISTORY
Coronary artery disease	15% (39)
Risk factors for atherosclerosis
Hypertension	65% (166)
Hypercholesterolemia	42% (107)
Diabetes Mellitus	31% (80)
Atrial fibrillation	11% (27)
Prior personal pacemaker placement	6% (15)
History of a solid tumor cancer	26% (66)
SOCIAL HISTORY
Current smoker	20% (51)
Alcohol use	33% (83)
Drug use	12% (31)