“…In addition, the authors found significantly greater odds of both disorders among students with family/friends who were injured by the tornado (PTSD: odds ratio (OR) 1.98, 95% confidence interval (CI) 1.01–3.92; depression: OR 2.05, 95% CI 1.03–4.07). A number of studies presented additional cross-sectional analyses of the same sample at three [ 53 ], six [ 39 , 47 , 51 ], nine [ 39 , 47 ], and 12 [ 39 ] months post-tornado, each exploring a slightly different conceptual model. In addition, several other studies appeared to use overlapping samples [ 46 , 50 , 52 , 54 ].…”