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Simplified depiction of final structural equation model for posttraumatic stress disorder (N = 1681). WTCD = World Trade Center disaster; PTSD = posttraumatic stress disorder; Year 1 = baseline survey, Year 2 = follow-up survey. Control variables in the model include gender, income, pre-WTCD depression, and pre-WTCD panic. Re-exp = reexperiencing (Criterion B), avoid = avoidance (Criterion C), and arousal = hyperarousal (Criterion D).
