Abstract
Psychotherapists routinely use both specific and non-specific strategies to deliver empirically supported treatments (ESTs). Psychotherapy adherence monitoring has traditionally focused on assessing therapist use of EST-specific strategies (to distinguish between ESTs), paying less attention to non-specific techniques common to multiple psychotherapies. This study used the Collaborative Study Psychotherapy Rating Scale (CSPRS) to evaluate therapist use of both specific and non-specific techniques in two affect-focused ESTs for depression. Blinded raters evaluated 180 recorded sessions of interpersonal psychotherapy (IPT) and brief supportive psychotherapy (BSP). Because IPT and BSP both emphasize attention to affective states and developing a warm therapy relationship, we expected overlap across scales measuring therapist warmth, empathy, and focus on feelings. In contrast, we expected differences in scales measuring therapist directiveness, as well as IPT- and BST-specific interventions. Results showed raters displayed good inter-rater reliability on primary subscales and could discriminate between two treatments with considerable overlap. Both IPT and BSP therapists used similarly high levels of non-specific, facilitative interventions. Expectedly, IPT therapists were more directive and used more IPT-specific strategies, while BSP therapists utilized more non-directive, supportive strategies. Unexpectedly, BSP therapists showed greater focus on feelings than IPT therapists. Exploratory analyses suggested that greater focus on feelings in early sessions was associated with greater depressive symptom reduction in the first eight weeks of treatment for both ESTs. Additional treatment adherence research is needed to investigate both shared and distinctive features of ESTs, as well as the effect of the relative use of specific versus non-specific interventions on psychotherapy outcomes.
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