Influence of family size and birth order on risk of cancer: a population-based study.

BMC Cancer · 2011 · PMC3103479 · PMID 21554674

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marginally significantno p-value reported

Combined effects for birth order and family size were marginally significant for thyroid gland tumors.

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highly significantno p-value reported

We found highly significant results independent of the birth order (one child families: RR = 0.67; two child families: RR = 0.73; three or four child families: RR = 0.75).

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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.