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BACKGROUND A large proportion of mothers in the Neonatal Intensive Care Unit (NICU) experience psychological distress, which is associated with adverse infant and parenting outcomes. Interventions addressing maternal anxiety in the NICU are scarce. AIMS To assess the effect of activity based group therapy on maternal anxiety in the NICU when compared to a control group. STUDY DESIGN The study was a prospective phase lag cohort study. In Phase 1 the control group was recruited and assessed using the State-Trait Anxiety Inventory (STAI-S) once at recruitment and again 4 weeks later. In phase 2, mothers were invited to take part in activity-based groups of 1 h duration once a week for 4 weeks. The STAI-S was administered before and after every group session. SUBJECTS Mothers of babies admitted in the NICU who consented to participate, had a working knowledge of Tamil or English and were likely to stay for 4 weeks for the treatment were included. OUTCOME MEASURES State anxiety assessed using the STAI-S. RESULTS Seventeen mothers each in the control and experimental groups completed the study. In the experimental group, there was a significant reduction in the post-test anxiety scores when compared to the pre-test in the first (p = 0.005), third (p = 0.07) and fourth (p = 0.009) sessions. The post-test anxiety scores of the intervention group was significantly lower than that of the control group (p = 0.009). CONCLUSION Activity based group therapy is effective as an intervention in reducing maternal anxiety in the NICU. SUMMARY Anxiety in mothers of infants admitted in the NICU has been associated with adverse infant and parenting outcomes. This study evaluated the feasibility and effectiveness of an activity based group intervention to reduce anxiety levels in mothers in the NICU. The study was a prospective phase lag cohort study. Anxiety levels were assessed in mothers in the control group at recruitment and then 4 weeks later. In the intervention group, activity based group sessions were conducted once a week for 4 weeks. State anxiety was assessed before and after every group session. In the intervention group the anxiety levels were significantly lower in the post-test, when compared to the pre-test. Also the number of mothers suffering from moderate to severe anxiety and the anxiety scores in the post-test were significantly lower in the intervention group when compared to the control group. We conclude that activity based group sessions are effective in reducing the state anxiety in mothers in the NICU. Improving maternal psychological wellbeing may indirectly contribute to better infant outcomes.