Economic and educational factors played roles in the development of regional vision impairment in Shandong province, China.

Sci Rep · 2021 · PMC8368192 · PMID 34400709

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showed a trendno p-value reported

The vision impairment prevalence showed a trend of decreasing first and then increasing from 2013 to 2017, with slight changes.

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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.