Red blood cell folate levels in Canadian Inuit women of childbearing years: influence of food security, body mass index, smoking, education, and vitamin use.

Can J Public Health · 2018 · PMC6267647 · PMID 29981096

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a clear trendno p-value reported

There was a clear trend of increasing RBCF levels with increased levels of income and education.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.