A meta-analysis of parental smoking and the risk of childhood brain tumors.

PLoS One · 2014 · PMC4109951 · PMID 25058491

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hedged sentence

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borderline significantno p-value reported

Although some of the summary RRs (maternal smoking before pregnancy and paternal smoking before pregnancy) were borderline significant, the magnitudes of these associations were quite modest and within the range in which various sources of bias could explain them.

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