Reviewing umbrella reviews of systematic reviews of original studies on the effects of air pollution on disease.

Environ Epidemiol · 2024 · PMC11305730 · PMID 39114736

Europe PMC DOI

hedged sentence

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closest p

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boldest claim

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may be significantno p-value reported

Or, there may be significant problems with some of the original studies that are not picked up by a systematic review.

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