Fig. 1.

Theoretical model of mechanisms of action in SEPA. Path of intervention to change in mediator = a. Path of change in mediator to change in outcome = b. Indirect effect = a * b. Intervention effect without controls (total effect) = c. Intervention effect after controlling for the indirect effect (mediated or direct effect) = c′. Variable names in italics in the indicate hypothesized mediator variables that showed a statistically significant intervention effect in initial analyses, and were included separately in the subsequent mediation analyses