Context-stratified Mendelian randomization, splitting analysis by exogenous subgroups with differing exposure distributions, detects nonlinear causal effects in simulations while producing a null vitamin D result across UK Biobank centres.
Instrumental variable analysis with a nonlinear exposure–outcome relationship
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Context-stratified Mendelian randomization: exploiting regional exposure variation to explore causal effect heterogeneity and non-linearity
Context-stratified Mendelian randomization, splitting analysis by exogenous subgroups with differing exposure distributions, detects nonlinear causal effects in simulations while producing a null vitamin D result across UK Biobank centres.