Fig. 1From: Estimating the natural indirect effect and the mediation proportion via the product methodMediation directed acyclic graph, where Y, X, M and W denote the outcome, exposure, mediator, and confounders of the exposure-outcome and exposure-mediator relationships. The NIE of exposure X on outcome Y through mediator M is highlighted in blue and the NDE of exposure X on outcome Y is highlighted in redBack to article page