Secondhand smoke exposure for different education levels: findings from a large, nationally representative survey in Turkey.

BMJ Open · 2022 · PMC8860053 · PMID 35177464

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may be significantno p-value reported

In addition, studies must account for variation within countries and acknowledge that there may be significant differences in prevalence and determinants between regions within the same country.

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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.