Figure 3.

Mediation model without (a) and with covariates (b) showing both the total and direct effect of serum 25(OH)D concentrations on the intensity of depressive symptomatology as measured by CES-D sum scores (path coefficients c and c′) and the indirect effect of serum 25(OH)D concentrations on CES-D scores mediated through interleukin 6 (IL-6) concentrations (path coefficient ab) in the study sample. The figure depicts the unstandardized path coefficients (a,b,c,c′ and ab; with * p < 0.050; ** p < 0.010; *** p < 0.001).