Mindfulness-Based Stress Reduction and Mindfulness-Based Cognitive Therapy as Interventions for Generalized Anxiety Disorder: A Meta-Analytic Review

This systematic review and meta-analysis examined the efficacy of mindfulness-based interventions (MBIs), specifically Mindfulness-Based Stress Reduction (MBSR) and Mindfulness-Based Cognitive Therapy (MBCT), in reducing anxiety symptoms in individuals with Generalized Anxiety Disorder (GAD). A review of the literature revealed that while GAD affects millions globally, many individuals diagnosed with GAD do not receive treatment. This review evaluated the effectiveness of MBIs using randomized controlled trials (RCTs) and non-RCTs, focusing on effect sizes, study quality, and control conditions. The central hypothesis was that MBCT would significantly reduce anxiety symptoms, particularly in comparison to inactive control groups. Meta-analytic results showed that MBSR yielded a large average effect size while MBCT demonstrated a smaller effect. Active controls also showed a large effect whereas inactive controls had no influence on GAD measures. Statistical heterogeneity was observed across studies. Methodological quality was mixed; most studies showed high risk of bias due to lack of blinding, inconsistent outcome measures, and small sample sizes. Other limitations included variable definitions of clinical thresholds for GAD, limited reporting on comorbidity, and sample compositions skewed toward female participants. Despite these limitations, the study supports the integration of MBIs in treatment planning for GAD, while emphasizing the need for more rigorous future research.