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Association of the insulin resistance syndrome and microalbuminuria among nondiabetic native Americans. The Inter-Tribal Heart Project.

This study investigated the association between microalbuminuria and the insulin resistance syndrome (IRS) among nondiabetic Native Americans. In a cross-sectional survey, age-stratified random samples were drawn from the Indian Health Service clinic lists for one Menominee and two Chippewa reservations. Information was collected from physical examinations, personal interviews, and blood and urine samples. The urinary albumin:creatinine ratio (ACR) was measured using a random spot urine sample. The IRS was defined by the number of composite traits: hypertension, impaired fasting glucose (IFG), high fasting insulin, low HDL cholesterol, and hypertriglyceridemia. Among the 934 eligible nondiabetic participants, 15.2% exhibited microalbuminuria. The prevalence of one, two, and three or more traits was 27.0, 16.6, and 7.4%, respectively. After controlling for age, sex, smoking, body mass index, education, and family histories of diabetes and kidney disease, the odds ratio (OR) for microalbuminuria was 1.8 (95% confidence interval [CI], 1.1 to 2.8) for one IRS trait, 1.8 (95% CI, 1.0 to 3.2) for two traits, and 2.3 (95% CI, 1.1 to 4.9) for three or more traits (versus no traits). The pattern of association appeared weaker among women compared with men. Of the individual IRS traits, only hypertension and IFG were associated with microalbuminuria. Among these nondiabetic Native Americans, the IRS was associated with a twofold increased prevalence of microalbuminuria. Health promotion efforts should focus on lowering the prevalence of hypertension, as well as glucose intolerance and obesity, in this population at high risk for renal and cardiovascular disease.