Objective: Relational and emotional vulnerability represent essential problems among patients with personality disorder (PD). Group psychotherapy is a central component of evidence-based PD treatments. Generally, patient and therapist interrelationships predict improvement in therapy.However, although treatment of patients with PD is a more complex process, group processes are poorly elaborated in PD research. Documentation of the psychometric quality of group process measures in PD samples is an important precursor of such research. The Group Questionnaire-GQ is based on concepts of group cohesion and climate, empathy, and alliance and aims to capture the quality of member-member, member-group and member-leader relationships in group therapy. A 3-latent factor structure (positive bond, positive work and negative relationship) has generally been supported.This study aimed to perform a psychometric analysis of GQ administered in a clinical population of patients with PD.Method: The study included 369 patients with PDs attending group psychotherapy in 14 outpatient treatment units on a specialist mental health service level within the Norwegian Network of Personality Disorders in the period 2017-2020. Psychometric analyses included 3-latent factors and 8 sub-facets.Results: The 3-latent factors, positive bond, positive work and negative relationship were replicated. Psychometric integrity of the tripartite relationship structure-member-member, membergroup and member-leader, with 8 sub-facets, was supported.Conclusions: The GQ with 3-latent factors and 8 sub-facets can be recommended for future research and clinical practice in patient populations with PD.
Highlights and Implications The study highlights that GQ can satisfactorily capture the group psychotherapy process for patients with personality disorder in its current form with three latent factors and eight sub facets Results replicate former research on the psychometric qualities of GQ Results implicate that the GQ can be useful in further research on PD treatment processes and mechanisms and mediators of change