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. Author manuscript; available in PMC: 2018 Jul 1.
Published in final edited form as: Environ Int. 2017 Apr 6;104:102–109. doi: 10.1016/j.envint.2017.03.019

Figure 1. Conceptual Model for Mediation Analysis.

Figure 1

aPathway ‘a’ shows the effect of PM2.5 (X1) on mediators in Wave 2 (M2), controlling for mediators in Wave 1 (M1)

bPathway ‘b’ shows the mediators’ effects on CCFM (Y2), controlling for cognitive test results in Wave 1 (Y1)

cPathway ‘c’ shows the effect of PM2.5 on CCFM with mediators included