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Journal of Bone and Mineral Metabolism

, Volume 34, Issue 6, pp 668–677 | Cite as

Z-score discordance and contributing factors in healthy premenopausal women with low bone mineral density: the Korean National Health and Nutrition Examination Survey 2008–9

  • Kyeong Hye Park
  • Jung Soo Lim
  • Kyoung Min Kim
  • Yumie Rhee
  • Sung-Kil LimEmail author
Original Article

Abstract

The premenopausal period is important for bone health and prevention of future fractures, but measuring bone mineral density (BMD) at only one site may not be sufficient to determine therapeutic strategies for low BMD in premenopausal women due to the presence of Z-score discordance. In this study, we investigated Z-score discordance in addition to contributing factors of idiopathic low BMD in healthy premenopausal Korean women. We studied 3003 premenopausal women aged 18–50 years, without secondary causes for low BMD and history of fragility fracture, who had participated in the Fourth Korean National Health and Nutrition Examination Surveys (2008–2009). Low body mass index (BMI), low vitamin D level, and low body muscle mass were associated with low BMD even in premenopausal women. Risk factors differed depending on the anatomic site. Low BMI and low vitamin D level were risk factors for low femoral neck BMD (FN-BMD), but not for low lumbar spine BMD (LS-BMD). Only total muscle mass had a slight effect on low LS-BMD. Z-score discordance was much higher than expected, in 75 and 73.8 % of the low LS-BMD and low FN-BMD groups, respectively. Our findings suggest the need to consider BMD discordance in premenopausal women and also to provide information on correctable factors affecting low BMD in younger populations. Long-term follow-up is needed to evaluate the possible effect of Z-score discordance on the prognosis of osteoporosis and subsequent fracture risk.

Keywords

Premenopausal women Low bone mineral density Z-score Discordance 

Notes

Acknowledgments

This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MEST) (No. 20110001024).

Compliance with ethical standards

Conflict of interest

All authors have no conflict of interest.

Supplementary material

774_2015_715_MOESM1_ESM.pdf (152 kb)
Supplementary material 1 (PDF 152 kb)

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Copyright information

© The Japanese Society for Bone and Mineral Research and Springer Japan 2015

Authors and Affiliations

  • Kyeong Hye Park
    • 1
    • 2
  • Jung Soo Lim
    • 2
    • 3
  • Kyoung Min Kim
    • 4
  • Yumie Rhee
    • 5
  • Sung-Kil Lim
    • 5
    Email author
  1. 1.Division of Endocrinology and Metabolism, Department of Internal MedicineNational Health Insurance Service Ilsan HospitalGoyangSouth Korea
  2. 2.Yonsei University Graduate School of MedicineSeoulSouth Korea
  3. 3.Department of Internal MedicineYonsei University Wonju College of MedicineWonjuSouth Korea
  4. 4.Department of Internal MedicineSeoul National University Bundang HospitalSungnamSouth Korea
  5. 5.Division of Endocrinology, Department of Internal MedicineYonsei University College of MedicineSeoulSouth Korea

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