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• W2111735528 abstract "Mendelian randomization uses genetic variants, assumed to be instrumental variables for a particular exposure, to estimate the causal effect of that exposure on an outcome. If the instrumental variable criteria are satisfied, the resulting estimator is consistent even in the presence of unmeasured confounding and reverse causation.We extend the Mendelian randomization paradigm to investigate more complex networks of relationships between variables, in particular where some of the effect of an exposure on the outcome may operate through an intermediate variable (a mediator). If instrumental variables for the exposure and mediator are available, direct and indirect effects of the exposure on the outcome can be estimated, for example using either a regression-based method or structural equation models. The direction of effect between the exposure and a possible mediator can also be assessed. Methods are illustrated in an applied example considering causal relationships between body mass index, C-reactive protein and uric acid.These estimators are consistent in the presence of unmeasured confounding if, in addition to the instrumental variable assumptions, the effects of both the exposure on the mediator and the mediator on the outcome are homogeneous across individuals and linear without interactions. Nevertheless, a simulation study demonstrates that even considerable heterogeneity in these effects does not lead to bias in the estimates.These methods can be used to estimate direct and indirect causal effects in a mediation setting, and have potential for the investigation of more complex networks between multiple interrelated exposures and disease outcomes." @default.
• W2111735528 created "2016-06-24" @default.
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• W2111735528 date "2014-08-22" @default.
• W2111735528 modified "2023-10-18" @default.
• W2111735528 title "Network Mendelian randomization: using genetic variants as instrumental variables to investigate mediation in causal pathways" @default.
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• W2111735528 doi "https://doi.org/10.1093/ije/dyu176" @default.
• W2111735528 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4469795" @default.
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