Air pollutants and outpatient visits for cardiovascular disease in a severe haze-fog city: Shijiazhuang, China.

BMC Public Health · 2019 · PMC6814061 · PMID 31651288

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an increasing trendno p-value reported

Although the ORs of lag 1 were not significant, the ORs showed an increasing trend.

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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.