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American Journal of Epidemiology Vol. 153, No. 6 : 581-586
Copyright © 2001 by The Johns Hopkins University School of Hygiene and Public Health

ORIGINAL CONTRIBUTIONS

Life-Course Predictors of Ultrasonic Heel Measurement in a Cross-sectional Study of Immigrant Women from Southeast Asia

Diane S. Lauderdale1, Talya Salant2, Katherine L. Han3 and Phuong L. Tran3,4

1 Department of Health Studies, University of Chicago, Chicago, IL.
2 Pritzker School of Medicine, University of Chicago, Chicago, IL.
3 Weiss Health Center, Chicago, IL.
4 Department of Medicine, University of Chicago, Chicago, IL.

Few studies address chronic disease risk for Southeast Asians in the United States. In 1999, the authors conducted a cross-sectional study of bone mineral density (BMD) estimated from ultrasonic calcaneal measurements in women born in Southeast Asia who then lived in Chicago, Illinois. The study addressed three questions: Do Southeast-Asian women have relatively low BMD? What factors before and after immigration are associated with BMD? Are factors that reflect the childhood/adolescent environment equally associated with BMD for postmenopausal and premenopausal women? An interviewer-administered bilingual questionnaire collected immigration, reproductive, and lifestyle data from 213 women (aged 20–80 years) born in Vietnam, Cambodia, or Laos. The authors found that the estimated mean BMD of postmenopausal Southeast-Asian women was lower than the reference values for White women. Four summary indicators of childhood/adolescent environment were predictive of higher BMD: more years of education, earlier age at menarche, lower height, and coastal birth; these indicators were more strongly associated with BMD for premenopausal (multiple-partial R2 = 0.21) than postmenopausal (R2 = 0.06) women. Young-adult exposures (e.g., early first pregnancy and age at immigration) and proximal lifestyle factors (e.g., smoking, physical inactivity, vegetarian diet, and betel nut use) were also assessed as potential predictors of BMD.

Asian Americans; bone density; calcaneus; emigration and immigration; women's health

Abbreviations: BMD, bone mineral density


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