Folate intake, serum folate levels, and prostate cancer risk: a meta-analysis of prospective studies.

BMC Public Health · 2014 · PMC4320532 · PMID 25543518

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did not reach statistical significanceno p-value reported

The reason for this difference could be that studies with longer follow-up periods (greater than 15 years) did not reach statistical significance owing to the low incidence of prostate cancer.

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