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Change in IES-R mean item score from 6 months postdisaster to 24 months postdisaster (T2) split into three clusters. Mean item score of Impact of Event Scale Revised (IES-R), 0–4, is used to show change in the three clusters of the scale from 6 months to 2 years after the tsunami. Statistical test showed a significant reduction in Intrusion and Hyperarousal subscale scores but not in Avoidance subscale-score.
