Contribution of passive smoking to respiratory cancer.

Environ Health Perspect · 1986 · PMC1474280 · PMID 3830114

Europe PMC DOI

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not quite statistically significantno p-value reported

In a smaller prospective study, Neu- tel and Buck (53) reported a 30% increase in risk of childhood cancer associated with mothers' smoking that was not quite statistically significant.

also in 341 other papers

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.