Dataset for meta-analysis on effects of gratitude-expression interventions

This is the dataset for a meta-analysis that synthesized results from 23 studies, involving 25 samples, to examine the effect of expressed gratitude interventions on positive indicators of psychological wellbeing. The results showed that expressed gratitude interventions had a significant effect on positive indicators of psychological wellbeing relative to neutral comparison groups (Hedges' g = 0.22, 95% CI [0.11, 0.33], p < .001). Intervention length and duration from baseline to final assessment did not significantly moderate effect sizes across studies. The present findings indicate that expressed gratitude interventions have value in improving psychological wellbeing.