Statistical trends in the Journal of the American Medical Association and implications for training across the continuum of medical education.

PLoS One · 2013 · PMC3813707 · PMID 24204794

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an increasing trendno p-value reported

The number of published RCTs and cohort studies differed significantly across years of interest, with an increasing trend of publication.

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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.