Chronic traffic-related air pollution and stress interact to predict biologic and clinical outcomes in asthma.

Environ Health Perspect · 2008 · PMC2453169 · PMID 18629323

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an unexpected trendno p-value reported

This was an unexpected trend, and it is unclear what the implications are.

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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.