Vitamin D status during pregnancy in a multi-ethnic population-representative Swedish cohort

Bärebring, Linnea, Schoenmakers, Inez, Glantz, Anna, Hulthén, Lena, Jagner, Åse, Ellis, Joy, Bärebring, Mattias, Bullarbo, Maria and Augustin, Hanna (2016) Vitamin D status during pregnancy in a multi-ethnic population-representative Swedish cohort. Nutrients, 8 (10). ISSN 2072-6643

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Abstract

There is currently little information on changes in vitamin D status during pregnancy and its predictors. The aim was to study the determinants of change in vitamin D status during pregnancy and of vitamin D deficiency (<30 nmol/L) in early pregnancy. Blood was drawn in the first (T1) and third trimester (T3). Serum 25-hydroxyvitamin D (25(OH)D) (N = 1985) was analysed by liquid chromatography tandem-mass spectrometry. Season-corrected 25(OH)D was calculated by fitting cosine functions to the data. Mean (standard deviation) 25(OH)D was 64.5(24.5) nmol/L at T1 and 74.6(34.4) at T3. Mean age was 31.3(4.9) years, mean body mass index (BMI) was 24.5(4.2) kg/m2 and 74% of the women were born in Sweden. Vitamin D deficiency was common among women born in Africa (51%) and Asia (46%) and prevalent in 10% of the whole cohort. Determinants of vitamin D deficiency at T1 were of non-North European origin, and had less sun exposure, lower vitamin D intake and lower age. Season-corrected 25(OH)D increased by 11(23) nmol/L from T1 to T3. The determinants of season-corrected change in 25(OH)D were origin, sun-seeking behaviour, clothing style, dietary vitamin D intake, vitamin D supplementation and recent travel <35° N. In conclusion, season-corrected 25(OH)D concentration increased during pregnancy and depended partly on lifestyle factors. The overall prevalence of vitamin D deficiency was low but common among women born in Africa and Asia. Among them, the determinants of both vitamin D deficiency and change in season-corrected vitamin D status were fewer, indicating a smaller effect of sun exposure.

Item Type:	Article
Additional Information:	This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
Uncontrolled Keywords:	pregnancy,vitamin d status,vitamin d deficiency,sweden
Faculty \ School:	Faculty of Medicine and Health Sciences > Norwich Medical School
UEA Research Groups:	Faculty of Medicine and Health Sciences > Research Groups > Musculoskeletal Medicine Faculty of Medicine and Health Sciences > Research Groups > Nutrition and Preventive Medicine
Depositing User:	Pure Connector
Date Deposited:	25 Oct 2016 14:09
Last Modified:	03 Aug 2023 14:30
URI:	https://ueaeprints.uea.ac.uk/id/eprint/61055
DOI:	10.3390/nu8100655

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