American Journal of Epidemiology Advance Access originally published online on June 14, 2007
American Journal of Epidemiology 2007 166(5):527-533; doi:10.1093/aje/kwm105
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ORIGINAL CONTRIBUTIONS |
Clustering of Long-term Trends in Metabolic Syndrome Variables from Childhood to Adulthood in Blacks and Whites
The Bogalusa Heart Study
From the Tulane Center for Cardiovascular Health, Tulane University, New Orleans, LA
Correspondence to Dr. Gerald S. Berenson, Tulane Center for Cardiovascular Health, Tulane University, 1440 Canal Street, Room 1829, New Orleans, LA 70112 (e-mail: berenson{at}tulane.edu).
Received for publication August 2, 2006. Accepted for publication March 7, 2007.
Clustering of long-term rates of change in metabolic syndrome variables (body mass index, homeostasis model assessment of insulin resistance, ratio of triglycerides to high-density lipoprotein cholesterol, and mean arterial pressure) from childhood to adulthood was evaluated longitudinally (1982–2003) in a cohort of 389 Blacks and 631 Whites who were examined 3–6 times both as children (ages 4–17 years) and as adults (ages 18–38 years) over an average of 16 years (3,874 observations). The incremental area under the growth curve was used as a measure of long-term rates of change in risk variables since childhood. Intraclass correlations, a measure of the degree of clustering, among the four variables were significant (p < 0.001) for childhood, adulthood, and incremental area values and were higher in adulthood than in childhood. Blacks showed a higher degree of clustering of long-term rates of change in risk variables than did Whites. Adjustment for body mass index reduced the degree of clustering by approximately 50%. These results show that metabolic syndrome variables coexist in terms not only of their levels in childhood and adulthood but also of long-term rates of change. Obesity is of critical importance in the development of metabolic syndrome, and its prevention beginning in childhood needs to be addressed.
insulin resistance; longitudinal studies; metabolic syndrome X; obesity
Abbreviations: HDLC, high-density lipoprotein cholesterol; HOMA, homeostasis model assessment; ICC, intraclass correlation coefficient
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