"Sleep disparity" in the population: poor sleep quality is strongly associated with poverty and ethnicity.

BMC Public Health · 2010 · PMC2927542 · PMID 20701789

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highly significantno p-value reported

The association between impoverished Whites and poor sleep remained highly significant (OR = 1.95, 95% CI 1.47-2.58).

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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.