Fig. 1

Receiver operating curve for IES-6 versus CAPS for DSM-IV Diagnosis of PTSD (posttraumatic stress disorder); area under the curve (95% confidence interval) = 0.93 (0.86, 1.00); Based on n = 60 (13% with PTSD at time of interview, 26% ever experiencing PTSD post-ARDS). Optimal cut-off score for IES-6 is 1.75