marginally significantp = 0.049
The total effect of TNF-alpha on depressive symptoms was significant (c = 6.32, SE = 1.84, t = 3.44, p = 0.001), when controlling for PHQ-15, the direct effect remained marginally significant (c' = 2.99, SE = 1.50, t = 1.99, p = 0.049), suggesting a partial mediation of PHQ-15 ( figure 2 ).