Preliminary study on alterations of altitude road traffic in China from 2006 to 2013.

PLoS One · 2017 · PMC5302387 · PMID 28187203

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a decreasing trendno p-value reported

RTAs and RTA-induced casualties in the high-altitude provinces indicated a decreasing 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.