Diagnostic performance of different sampling approaches for SARS-CoV-2 RT-PCR testing: a systematic review and meta-analysis.

Lancet Infect Dis · 2021 · PMC8041361 · PMID 33857405

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a decreasing trendno p-value reported

an increasing trendno p-value reported

However, PPVs showed an increasing trend for higher prevalence and a decreasing trend for lower prevalence ( appendix p 2 ), whereas NPVs showed a decreasing trend for higher prevalence and an increasing trend for lower prevalence ( appendix p 2 ).

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