Does the group in group psychotherapy matter? A meta-analysis of the intraclass correlation coefficient in group treatment research.

Objective: Over the last 3 decades, group treatment researchers have become increasingly knowledgeable of the impact of within-group dependency on analyses of group treatment data and of mutual influence processes that occur within therapy groups. Despite these advancements, there remains a lack of consensus on the magnitude of mutual influence, or group effects, in group treatment research. As such, this study sought to estimate the size of group effects on members' posttreatment outcomes by meta-analyzing the intraclass correlation coefficients (ICCs) in group treatment research.

Construction and validation of the Multicultural Orientation Inventory-Group Version.

Given the continued racial/ethnic diversification of the United States, it is not uncommon for therapy groups to consist of members with diverse racial/ethnic backgrounds and various cultural identities. Scholars have underscored how this cultural diversity can directly impact many processes and outcomes of group-based interventions (Chen, Kakkad, & Balzano, 2008). However, there is presently a paucity of empirical research testing the relationship between cultural processes of therapy groups and members' outcomes.