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Optimal vitamin D status and its relationship with bone and mineral metabolism in Hong Kong Chinese.

Abstract：

BACKGROUND:Although 25-hydroxyvitamin D (25[OH]D) is commonly used to define vitamin D status, there is no consensus on the cutoff levels for vitamin D deficiency and insufficiency. In this study, we aimed to identify the 25(OH)D threshold that maximally suppressed parathyroid hormone (PTH) in Hong Kong Chinese population. METHODS:The study included 5276 participants (70% female) of the Hong Kong Osteoporosis Study aged 20 or above who had total 25(OH)D measured. Three-phase segmented regression was used to identify the optimal break-point between 25(OH)D and PTH. RESULTS:The prevalence of vitamin D deficiency observed was 43.8% and the prevalence of insufficient (<75nmol/L) or deficient (<50nmol/L) vitamin D levels was 90.1% in our study population. Using unadjusted three-phase segmented regression, the estimated first and second break-point of 25(OH)D on PTH suppression were 32nmol/L (95% CI: 29-35) and 89nmol/L (95% CI: 77-101) with an r2 of 0.048, whereas the estimated first and second break-point of 25(OH)D were 27nmol/L (95% CI: 24-30) and 47nmol/L (95% CI: 37-56) after adjusting for factors affecting bone and mineral metabolism. In addition, the relationship between 25(OH)D and PTH significantly differed by sex and age. CONCLUSION:The threshold for 25OHD at the point of maximal suppression of PTH estimated in this study was lower than the suggested threshold of vitamin D deficiency in the literature, perhaps due to race or assay differences, and the relationship between vitamin D and PTH changed with sex and age. Standardization in the methodology of searching for the optimal break-point is desirable so that a consensus on cutoff points can be obtained.

journal_name

Bone

journal_title

Bone

authors

Leung RY,Cheung BM,Nguyen US,Kung AW,Tan KC,Cheung CL

doi

10.1016/j.bone.2017.01.030

subject

Has Abstract

pub_date

2017-04-01 00:00:00

pages

293-298

eissn

8756-3282

issn

1873-2763

pii

S8756-3282(17)30030-3

journal_volume

97

pub_type

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