Background Posttraumatic stress disorder (PTSD) symptoms are common in acute
respiratory distress syndrome (ARDS) survivors. Brief screening instruments are needed for
clinical and research purposes. We evaluated internal consistency, external construct, and
criterion validity of the Impact of Event Scale-6 (IES-6; 6 items) compared to the original
Impact of Event Scale—Revised (IES-R; 22 items) and to the Clinician Administered PTSD
Scale (CAPS) reference standard evaluation in ARDS survivors. Methods This study is a …

The error in the abstract currently reads: The IES-6 demonstrated internal consistency over
multiple time points up to 5years after ARDS (Cronbach's alpha= 0.96; 95% confidence
interval (CI) 0.94 to 0.97). It should instead read in the abstract: The IES-6 demonstrated
internal consistency over multiple time points up to 5years after ARDS (Cronbach's alpha=
0.86 to 0.91) and high correlation with the IES-R (0.96; 95% confidence interval (CI): 0.94 to
0.97).