The methodological and reporting characteristics of Campbell reviews: A systematic review.

Campbell Syst Rev · 2021 · PMC8356304 · PMID 37133262

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an increasing trendno p-value reported

An increasing trend over time was observed for both the percentage of high and moderate methodological quality of reviews and the median number of PRISMA items reported.

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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.