The role of ambient ozone in epidemiologic studies of heat-related mortality.

Environ Health Perspect · 2012 · PMC3548272 · PMID 22899622

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borderline significantno p-value reported

(2008) found borderline significant effect modification by ozone in two counties, but none in their combined analysis of nine counties in California, and they found no evidence of confounding by ozone.

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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.