A Survey of Visual Impairment in Children Attending a Blind School in South India.

Indian J Community Med · 2021 · PMC8281874 · PMID 34321755

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a definite trendno p-value reported

1 in 10,000–20,000),[ 5 ] it is difficult to state whether this is a definite trend or a manifestation of Berksonian bias.

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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.