Findings indicate significant clustering of acute stress scores, Moran's I = 0.24, z = 2.91, p = .004; fears and worries, Moran's I = 0.25, z = 2.39, p = .017; and probable PTSD at Wave 2, Moran's I = 0.49, z = 5.16; p < .001, and at Wave 5, Moran's I = 0.26, z = 2.51, p = .012, in the Boston metropolitan area, with high distress clusters found near downtown Boston and the attack site.
Among veterans who ever had posttraumatic stress disorder (PTSD), 50.3% had a current diagnosis at the second assessment; of those who had a current diagnosis at Wave 1, 46.9% were also current at Wave 2.