Maternal smoking during pregnancy is associated with mitochondrial DNA methylation.

Environ Epigenet · 2016 · PMC5624552 · PMID 28979800

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a clear trendno p-value reported

It is possible that our small sample size does not afford us enough power to discern a clear trend.

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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.