Emergence of racial/ethnic differences in infant sleep duration in the first six months of life.

Sleep Med X · 2019 · PMC8041110 · PMID 33870162

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may be significantno p-value reported

Biological factors may also contribute, and there may be significant interactions between race/ethnicity and SES on infant sleep outcomes.

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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.