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(Circulation. 1997;96:4319-4325.)
© 1997 American Heart Association, Inc.

Articles

Summary Measures of the Insulin Resistance Syndrome Are Adverse Among Mexican-American Versus Non-Hispanic White Children

The Corpus Christi Child Heart Study

Lyn Steffen Batey, MPH; RD; David C. Goff, Jr, MD, PhD; Susan R. Tortolero, PhD; Milton Z. Nichaman, MD, ScD; Wenyaw Chan, PhD; Frances A. Chan, MS; JoAnne Grunbaum; EdD; Craig L. Hanis, PhD; ; Darwin R. Labarthe, MD, PhD

From the Southwest Center for Prevention Research; School of Public Health; University of Texas Houston Health Science Center; Houston.

Correspondence to Lyn Steffen Batey, MPH, RD, University of Texas Houston Health Science Center, School of Public Health, 1200 Herman Pressler Blvd, Houston, TX 77030. E-mail lsteffen{at}utsph.sph.uth.tmc.edu

Background Mexican-American (MA) adults are known to have a greater burden of diabetes and insulin resistance than non-Hispanic white (NHW) people. In this report, we examined data obtained from MA and NHW third-grade children for evidence of a pattern consistent with the insulin resistance syndrome. In addition, we developed two summary measures characterizing insulin resistance syndrome to compare measures of this syndrome among our population.

Methods and Results Data regarding fasting insulin, triglycerides, HDL cholesterol, systolic blood pressure, and body mass index (BMI) were available for 403 third-grade children. Median levels of insulin and glucose were significantly higher in MA boys and girls than in NHW boys and girls. Risk factors characterizing insulin resistance, including levels of insulin, triglycerides, systolic blood pressure, HDL cholesterol, and BMI were categorized as above or below the total population median. MA children were more likely than NHW children to have three or more adverse risk factors (55% versus 37%). When risk factors were converted to Z scores, and the five Z scores were summed for each individual, MA boys and girls had higher mean scores than NHW boys and girls (means for boys, 0.65 versus -0.97, P<.0001; girls, 0.52 versus -0.30, P<.04). Principal components analysis was used to create a summary score or index representing the insulin resistance syndrome. This summary score was significantly higher among MA boys and girls than NHW boys and girls (means for boys, 0.34 versus -0.72, P<.0001; girls, 0.35 versus -0.04, P=.056).

Conclusions Our results support the hypothesis that MA children exhibit a greater degree of the insulin resistance syndrome than NHW children, especially among boys. We conclude that some of the factors responsible for the increased risk of NIDDM seen among MA adults are demonstrable in childhood.

Key Words: risk factors • insulin • caronary disease

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