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Table 4 Internal consistency: Cronbach’s alpha statistic for the IES-R and IES-6

From: Screening for posttraumatic stress disorder in ARDS survivors: validation of the Impact of Event Scale-6 (IES-6)

Follow-up visitIES-R*IES-6**
3 months0.940.86
6 months0.950.86
12 months0.960.90
24 months0.950.85
36 months0.950.86
48 months0.960.91
60 months0.960.89
  1. *IES-R: Impact of Events Scale—Revised; **IES-6: Impact of Events Scale-6