J Med Assoc Thai 2009; 92 (9):17

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Vitamin D Status of Thai Premenopausal Women
Soontrapa S Mail, Soontrapa S , Bunyaratavej N , Rojanasthien S , Kittimanon N , Lektrakul S

Vitamin D insufficiency of Thai elderly women in urban area were higher than in rural area
because of the difference in life style. Until now there are no any evidences about vitamin D status in Thai
premenopausal women.

This study was the multicenters study from 5 provinces of Thailand which cover all region of
Thailand except southern area.

The mean (SE) of calcidiol level of Thai premenopausal women was 29.09(0.42) ng/ml, and with the
cut point of < 35 ng/ml; the prevalence of vitamin D insufficiency was 77.81%. Chiang Mai had lowest
calcidiol level (25.09 ng/ml) and had highest PTH, and bone resorption markers. The prevalence of vitamin D
insufficiency was highest in Khon Kaen (88.78%) and Chiang Mai (84.62%) province respectively.

Life style modification to expose more sunlight should be advised for increasing the serum vitamin D
and lowering the risk of osteoporosis.

Keywords: Calcidiol, Premenopausal women, Vitamin D insufficiency

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