Sensitivity Analysis for Unmeasured Confounding in Meta-Analyses.

Sensitivity Analysis for Unmeasured Confounding in Meta-Analyses.
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DOI:
10.1080/01621459.2018.1529598
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发表时间:
2020
影响因子:
3.7
通讯作者:
VanderWeele TJ
VanderWeele TJ
中科院分区:
数学1区
文献类型:
--
作者:
Mathur MB;VanderWeele TJ

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Random-effects meta-analyses of observational studies can produce biased estimates if the synthesized studies are subject to unmeasured confounding. We propose sensitivity analyses quantifying the extent to which unmeasured confounding of specified magnitude could reduce to below a certain threshold the proportion of true effect sizes that are scientifically meaningful. We also develop converse methods to estimate the strength of confounding capable of reducing the proportion of scientifically meaningful true effects to below a chosen threshold. These methods apply when a “bias factor” is assumed to be normally distributed across studies or is assessed across a range of fixed values. Our estimators are derived using recently proposed sharp bounds on confounding bias within a single study that do not make assumptions regarding the unmeasured confounders themselves or the functional form of their relationships with the exposure and outcome of interest. We provide an R package, EValue, and a free website that compute point estimates and inference and produce plots for conducting such sensitivity analyses. These methods facilitate principled use of random-effects meta-analyses of observational studies to assess the strength of causal evidence for a hypothesis.
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