Ambient ozone exposure and children's acute asthma in New York City: a case-crossover analysis.

Environ Health · 2015 · PMC4373115 · PMID 25889205

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may be significantno p-value reported

No positive significant association was found on lag day 0 for either sex group, which may be expected, as asthma response may be progressive over subsequent days, or there may be significant delays in reaching medical care.

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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.