. Author manuscript; available in PMC: 2009 Apr 23.

Published in final edited form as: Diabetes. 2007 Mar;56(3):856–862. doi: 10.2337/db06-1305

TABLE 1.

Summary of primary study populations

Population	Study description	Sex (M/F)	BMI (kg/m²)	Age (years)
Caucasian case/control	Case/control	Control 73/115, case 134/57	29.3 (19.8-43.2)	56.9 ± 14.1
African-American case/control	Case/control	Control 90/92, case 189/164	31.2 (20.0-48.8)	50.0 ± 13.9
Utah Caucasian metabolic	Family-based metabolic study	50/72	27.5 (18.3-41.3)	39.3 ± 10.5
Arkansas Caucasian metabolic	Population-based metabolic study	73/135	30.8 (18.2-41.9)	36.4 ± 9.0

Data are arithmetic means for normal variables and geometric means for skewed variables (BMI), means (95% CI) transferred to the linear scale from the ln-transformation, or means ± SD.