Rethinking stress in parents of preterm infants: a meta-analysis.

PLoS One · 2013 · PMC3566126 · PMID 23405105

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a clear trendno p-value reported

Although there was a clear trend for parents of preterm-born children to experience more stress compared to parents of term-born children, the effect sizes were negligible to small.

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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.