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Determinants of bone mineral density in Chinese-American women

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Abstract

Summary

Few data are available regarding bone mineral density (BMD) and its determinants among Chinese Americans. We identified determinants of BMD among 359 Chinese-American women in order to identify risk factors for low BMD in this burgeoning population. BMD in Chinese-American women is influenced by a number of factors, including immigration.

Introduction

Osteoporosis and low BMD are common among Chinese women, including Chinese Americans, who are a growing population at risk for osteoporosis in the US. Few data are available regarding BMD and its determinants among Chinese-American women.

Methods

In this study, we examined predictors of BMD in 359 ambulatory Chinese-American women, ages 20–90, using stepwise multiple regression analysis. Variables in the model included age, weight, height, menarche age, years since menopause, immigration age, years in US, percentage of life in US, number of pregnancies, oral contraceptive use, family history of osteoporosis, family history of hip fracture, daily calcium intake, exercise, time outdoors, alcohol consumption and tobacco use.

Results

Among premenopausal women, weight was the strongest predictor of BMD, accounting for 10.5% of the variance at the lumbar spine (LS), 15.2% at the total hip (TH) and 16.6% at the femoral neck (FN). Time outdoors was also a positive predictor of BMD (1.4% at LS, 2.8% at TH and 1.6% at FN), while family history of osteoporosis (1.4% at TH) and age (3.7% at FN) were negative predictors. Among postmenopausal women, greater BMD at the LS and TH was associated with greater weight and earlier immigration age. Weight accounted for 16.4% of the variance at the LS and 19.8% at the TH; immigration age accounted for 3.1% of the variance at the LS and 4.1% at the TH. At the FN, years since menopause and weight were predictors of BMD, accounting for 14.4% and 8.7% of the variance, respectively. While older age at immigration had a negative effect on BMD, years in and proportion of life in the United States were not significant predictors of BMD.

Conclusions

Bone mineral density in Chinese-American women is influenced by a number of biological and lifestyle factors, including immigration. The results of this study provide new insights into risk factors for low bone density as they relate to environmental determinants in the growing population of Chinese-American women.

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Acknowledgments

This study was supported in part by: NIDDK T32 DK07271, the Endocrine Fellows Foundation, the Merck Medical School Grant Program, Procter and Gamble Pharmaceuticals and the Chinese-American Medical Society-Chinese American Independent Physicians Association (CAMS-CAIPA) Community Service Fund. We acknowledge Dr. Clyde Wu, whose vision and financial support were instrumental in the design and implementation of this study.

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Authors and Affiliations

  1. Department of Medicine, College of Physicians and Surgeons, Columbia University, PH8W-864, 630 West 168th Street, New York, NY, 10032, USA

    M. D. Walker, D. J. McMahon & J. P. Bilezikian

  2. Department of Medicine, New York Downtown Hospital, New York, NY, USA

    R. Babbar & G. Liu

  3. Department of Medicine, Brigham and Women’s Hospital, Boston, MA, USA

    A. Opotowsky

Authors
  1. M. D. Walker
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  2. R. Babbar
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  3. A. Opotowsky
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  4. D. J. McMahon
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  5. G. Liu
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  6. J. P. Bilezikian
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Correspondence to M. D. Walker.

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Walker, M.D., Babbar, R., Opotowsky, A. et al. Determinants of bone mineral density in Chinese-American women. Osteoporos Int 18, 471–478 (2007). https://doi.org/10.1007/s00198-006-0258-z

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  • DOI: https://doi.org/10.1007/s00198-006-0258-z

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