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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Association of neural tube defects and folic acid food fortification in Canada.

Many women do not receive folic acid supplements before conception. In response, most of Canada's cereal grain products were being fortified with folic acid by January, 1998, thereby providing an additional 0.1-0.2 mg per day of dietary folate to the Canadian population. We assessed the effect of supplementation on prevalence of open neural tube defects in the province of Ontario. Among 336 963 women who underwent maternal serum screening over 77 months, the prevalence of open neural tube defects declined from 1.13 per 1000 pregnancies before fortification to 0.58 per 1000 pregnancies thereafter (prevalence ratio 0.52, 95% CI 0.40-0.67, p<0.0001). At a population level, folic acid food fortification is associated with a pronounced reduction in open neural tube defects.[1]


  1. Association of neural tube defects and folic acid food fortification in Canada. Ray, J.G., Meier, C., Vermeulen, M.J., Boss, S., Wyatt, P.R., Cole, D.E. Lancet (2002) [Pubmed]
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