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• W2949275660 abstract "Abstract Background Mendelian randomization (MR) is a powerful tool in epidemiology that can be used to estimate the causal effect of an exposure on an outcome in the presence of unobserved confounding, by utilizing genetic variants that are instrumental variables (IVs) for the exposure. This has been extended to multivariable MR (MVMR) to estimate the effect of two or more exposures on an outcome. Methods and results We use simulations and theory to clarify the interpretation of estimated effects in a MVMR analysis under a range of underlying scenarios, where a secondary exposure acts variously as a confounder, a mediator, a pleiotropic pathway and a collider. We then describe how instrument strength and validity can be assessed for an MVMR analysis in the single-sample setting, and develop tests to assess these assumptions in the popular two-sample summary data setting. We illustrate our methods using data from UK Biobank to estimate the effect of education and cognitive ability on body mass index. Conclusion MVMR analysis consistently estimates the direct causal effect of an exposure, or exposures, of interest and provides a powerful tool for determining causal effects in a wide range of scenarios with either individual- or summary-level data." @default.
• W2949275660 created "2019-06-27" @default.
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• W2949275660 date "2018-12-10" @default.
• W2949275660 modified "2023-10-16" @default.
• W2949275660 title "An examination of multivariable Mendelian randomization in the single-sample and two-sample summary data settings" @default.
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• W2949275660 doi "https://doi.org/10.1093/ije/dyy262" @default.
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• W2949275660 hasPublicationYear "2018" @default.
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