Objective: To compare the efficacy of cognitive evolutionary therapy (CET) with cognitive therapy (CT) for depression.
Methods: Ninety-seven participants (78 females/19 males) were randomized to a single-blinded controlled trial (CET: n = 51 vs. CT: n = 46). Assessments were conducted at baseline, Sessions 4 and 8, posttreatment, and 3-month follow-up. Clinical diagnoses were made with Structured Clinical Interview for DSM-IV (SCID) and self-reports for depression and secondary outcomes.
Results: Although both groups showed significant reductions in depressive symptomatology, the overall Time × Treatment group interaction in the intent to treat analysis was not significant (p = .770, posttreatment: d = 0.39). However, CET was superior to CT at increasing engagement in social and enjoyable activities (p = .040, posttreatment: d = 0.83, p = .040) and showed greater reductions than the CT group in behavioral inhibition/avoidance (p = .047, d = 0.62). The between-group differences generally diminished at the 3-month follow-up.
Conclusions: CET is a novel therapy for depression that may add therapeutic benefits beyond those of CT.
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