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Optimal Serum Concentration of 25-Hydroxyvitamin D for Bone Health in Older Korean Adults

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Abstract

Optimal vitamin D concentrations for bone health have not been determined in the Korean population. The aim of this study was to define serum 25-hydroxyvitamin D (25[OH]D) concentrations that indicate insufficiency among older Korean adults as measured by serum intact parathyroid hormone (iPTH) concentrations and bone mineral density (BMD). We analyzed data from the Fourth Korea National Health and Nutrition Examination Survey (KNHANES IV-3), which was conducted in Korea in 2009. We enrolled 1,451 men and 1,870 women aged 49 years and above. After adjusting for variables that could potentially affect serum 25(OH)D concentrations, we found that serum iPTH concentrations began to increase at serum 25(OH)D concentrations below 12.1 ng/mL (30.2 nmol/L). In addition, total-femur BMD increased until serum 25(OH)D concentrations dropped below 20.4 ng/mL (50.9 nmol/L); no significant changes were observed thereafter. Assuming that serum 25(OH)D concentrations below 12.1 and 20.4 ng/mL represent vitamin D insufficiency, the prevalences of vitamin D insufficiency were 8.7 and 50.4 % in men and 17.9 and 66.3 % in women, respectively. Serum 25(OH)D cutoff values of 12.1 ng/mL (OR = 1.26) and 20.4 ng/mL (OR = 1.54) were associated with osteoporosis (P < 0.01); osteoporosis was not associated with a 25(OH)D cutoff value of 30 ng/mL (75.0 nmol/L). In conclusion, serum 25(OH)D concentrations of 20 ng/mL might be sufficient for bone health in older Korean adults.

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Acknowledgments

This study was performed using raw data from the Fourth Korea National Health and Nutrition Examination Survey (KNHANES IV), which was conducted by the Korean Centers for Disease Control and Prevention. This study was supported in part by a grant from the Clinical Research Institute, Kyung Hee University Hospital at Gangdong, in 2010 (KHNMCCRI-2010-001).

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Correspondence to Ho Yeon Chung.

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Hwang, YC., Ahn, HY., Jeong, IK. et al. Optimal Serum Concentration of 25-Hydroxyvitamin D for Bone Health in Older Korean Adults. Calcif Tissue Int 92, 68–74 (2013). https://doi.org/10.1007/s00223-012-9669-3

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  • DOI: https://doi.org/10.1007/s00223-012-9669-3

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