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- Title
Determinants of vitamin D status in pregnant women and neonates.
- Authors
Woolcott, Christy G.; Giguère, Yves; Weiler, Hope A.; Spencer, Anne; Forest, Jean-Claude; Armson, B. Anthony; Dodds, Linda
- Abstract
OBJECTIVES: Evidence suggests a beneficial effect of vitamin D on perinatal health; however, low vitamin D status is prevalent in pregnant women and neonates. The objective was to determine factors that are associated with vitamin D status of mothers in early pregnancy and neonates.METHODS: The study comprised 1,635 pregnant women from Quebec City and Halifax, Canada, 2002–2010. Vitamin D status was based on the concentration of 25-hydroxy-vitamin D [25(OH)D] determined with a chemiluminescence immunoassay in maternal sera collected at a median of 15 weeks’ gestation and in neonatal cord sera at delivery. A questionnaire with information on potential determinants was completed midpregnancy.RESULTS: A total of 44.8% of mothers and 24.4% of neonates had 25(OH)D concentrations <50 nmol/L. Adjusted mean (95% confidence interval) maternal 25(OH)D levels were higher in summer than in winter by 16.1 nmol/L (13.6–18.7), and in those in the highest versus the lowest category of education by 6.1 nmol/L (0.5–11.8), in BMI <25 kg/m2 versus BMI ≥35 kg/m2 by 8.2 nmol/L (4.0–12.3), and in the highest versus the lowest physical activity category by up to 9.5 nmol/L (2.9–16.1). Determinants of neonatal 25(OH)D levels were similar but also included maternal age, dairy intake, supplement use and 25(OH)D level.CONCLUSION: This study suggests that vitamin D status of pregnant women and/or neonates might be improved through supplementation, adequate dairy intake, a move towards a healthy pre-pregnancy body weight, and participation in physical activity. Controlled studies are needed to determine the effectiveness of interventions aimed at these factors.
- Publication
Canadian Journal of Public Health, 2016, Vol 107, Issue 4/5, pe410
- ISSN
0008-4263
- Publication type
Article
- DOI
10.17269/CJPH.107.5629