Environmental extreme temperature and daily preterm birth in Sabzevar, Iran: a time-series analysis.

Environ Health Prev Med · 2019 · PMC6320631 · PMID 30611198

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a decreasing trendno p-value reported

A decreasing trend in risk estimates at percentiles 1st, 25th, 75th, and 99th for all heat stress indexes was observed from index day of delivery to further lag days.

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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.