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Association between vitamin D and bone mineral density in Japanese adults: the Unzen study

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Abstract

Summary

We showed an association between serum concentrations of vitamin D and bone health among community-dwelling adults in Japan after adjustment for confounding factors, with 730 participants in a city, with concentrations of 25(OH) vitamin D, and with parameters of quantitative ultrasound.

Purpose

The primary objective of this study was to examine the correlation between serum 25-hydroxyvitamin D (25(OH)D) concentration and bone indicators as measured by quantitative ultrasound in middle-aged and older Japanese adults living in low-latitude seaside areas during summer and autumn.

Methods

We conducted a cross-sectional study, the Unzen study, on community-dwelling Japanese adults who participated to periodic health examinations between 2011 and 2013 (during the months of May to November).

Results

A total of 301 men (mean (SD) age, 67.9 (8.2) years; range, 50–92 years) and 429 women (mean (SD) age, 67.9 (7.7); range, 50–89 years) participated in this study. Serum 25(OH)D levels and quantitative ultrasound parameters (broadband ultrasound (BUA), speed of sound (SOS), and stiffness index of the calcaneus were measured for the participants. We excluded two men and 28 women from the 730 participants because they were on medication for osteoporosis. So, 299 men and 401 women were included in the final data analysis. The prevalence of vitamin D insufficiency (< 30 ng/ml) was very high: 71.9% in men and 95.5% in women. In women, the log(25(OH)D) positively and significantly correlated with SOS (p = 0.011) and stiffness index (p = 0.028) but not with BUA (p = 0.176). In men, the log(25(OH)D) did not correlate with the BUA, SOS, or stiffness index (p = 0.218, 0.420, and 0.262, respectively).

Conclusions

Serum 25(OH)D levels were associated with SOS or stiffness index in women but not in men.

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Data availability

The datasets are available from the corresponding author in the case of reasonable request. The datasets of the Unzen study analyzed in the current study are not publicly available because the datasets include in-depth information and we are planning to report other association studies using the same dataset.

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Funding

This work was supported by JSPS KAKENHI Grant No. JP23370105.

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Contributions

Study design: YH and KA. Conducted the study: MO and KA. Data collection/analysis: YH, KA, TN, YT, SM, YA, NT, MK, TPJ, HG, MH, YS, RT, and MK. Statistical analysis: KA. Drafting the manuscript: YH, KA, TN, TPJ, and KA. Revising the manuscript content: YT, SM, YA, NT, MK, HG, MH, YS, RT, MK, MO, and KA. Approving the final version of the manuscript: All authors. KA takes responsibility for the integrity of the data analysis.

Corresponding author

Correspondence to Kazuhiko Arima.

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Honda, Y., Arima, K., Nishimura, T. et al. Association between vitamin D and bone mineral density in Japanese adults: the Unzen study. Arch Osteoporos 16, 127 (2021). https://doi.org/10.1007/s11657-021-00984-9

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