China's regional public safety efficiency: a data envelopment analysis approach.

Ann Reg Sci · 2021 · PMC7505499 · PMID 32982029

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an increasing trendno p-value reported

These regions also demonstrated an increasing trend in their public safety efficiency, with Ningxia showing the fastest growth.

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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.