Variations of pterygium prevalence by age, gender and geographic characteristics in China: A systematic review and meta-analysis.

PLoS One · 2017 · PMC5371366 · PMID 28355301

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an increasing trendno p-value reported

The prevalence of pterygium showed an increasing trend with the increase of age in both men and women.

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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.