Short-term effects of carbon monoxide on mortality: an analysis within the APHEA project.

Environ Health Perspect · 2007 · PMC2072841 · PMID 18007988

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marginally significantno p-value reported

CO associations with both total and cardiovascular mortality were confounded by BS and NO 2 under both methods for seasonality control, but remained marginally significant.

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marginally statistically significantno p-value reported

There was indication of confounding with black smoke and nitrogen dioxide, but the pollutant-adjusted effect of CO on mortality remained at least marginally statistically significant.

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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.