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. 2012 Jan 15;185(2):199–205. doi: 10.1164/rccm.201104-0721OC

Figure 1.

Figure 1.

Scheme of a mediation model. Conventionally the path X to Y (without M) is the total effect, with (c) being the direct effect and (c′) being the indirect effect (ab). M = the mediating variable; X = the independent variable; Y = the dependent variable.