Predictors of therapeutic alliance: Patient attachment and the personal style of the therapist.

Background: The therapeutic alliance is crucial for psychotherapy effectiveness. Research has examined patient attachment and therapist personal style, but their impact on different treatment phases and alliance subcomponents remains unclear. This study analyzes their predictive role in the alliance, distinguishing between initial and advanced stages. Method: 264 participants and 28 therapists from four private Madrid-based centers participated. Patient symptomatology, attachment, and therapeutic alliance were measured, along with therapist personal style. Two groups were formed: initial stage (≤5 sessions) and advanced stage (≥ 6 sessions). Results: Attachment avoidance and overall functioning predicted alliance in the initial phase, while therapist attentiveness was more relevant in the advanced phase. Expressive function influenced the therapeutic bond, and therapist age had a moderating effect. Conclusions: The therapeutic alliance varies by treatment stage. Patient attachment avoidance is a constant predictor, while therapist style modulates its impact. Tailoring interventions to patient profiles and treatment phases enhances alliance and clinical outcomes.