Fragmented maternal sleep is more strongly correlated with depressive symptoms than infant temperament at three months postpartum.

Arch Womens Ment Health · 2009 · PMC2700868 · PMID 19396527

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did not reach statistical significanceno p-value reported

The correlations between parental ratings of infant temperament and maternal depressive symptoms at three months postpartum were in the presumed direction, but did not reach statistical significance.

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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.