Prevalence of vision impairment and refractive error in school children in Ba Ria - Vung Tau province, Vietnam.

Clin Exp Ophthalmol · 2014 · PMC4291105 · PMID 24299145

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did not reach statistical significanceno p-value reported

18.0%); however, gender did not reach statistical significance in the multivariate model, which accounted for the multistage cluster sampling design.

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an increasing trendno p-value reported

The prevalence of VI due to myopia showed an increasing trend from 19.2% in 12 years aged children to 22.8% in 14 years and 20.9% in children aged 15 years.

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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.