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Table 5 External construct validity (related and unrelated measures) for IES-R and IES-6

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

 IES-RIES-6
 r (95% CI)*r (95% CI)*
Related measures
 SF-36 Mental Health Domain−0.45 (− 0.48, − 0.42)− 0.42 (− 0.46, − 0.39)
 SF-36 Mental Component Summary− 0.48 (− 0.52, − 0.45)− 0.46 (− 0.49, − 0.42)
EQ-5D-3L—Anxiety/Depression item0.33 (0.29, 0.37)0.32 (0.28, 0.35)
HADS—Anxiety Subscale0.55 (0.52, 0.58)0.52 (0.49, 0.55)
HADS—Depression Subscale0.42 (0.39, 0.46)0.40 (0.37, 0.44)
Unrelated measures
 SF-36 Role Physical Domain− 0.30 (− 0.34, − 0.26)− 0.27 (− 0.32, − 0.24)
 SF-36 Physical Function Domain− 0.23 (− 0.26, − 0.19)− 0.21 (− 0.24, − 0.18)
 EQ-5D-3L Mobility0.16 (0.12, 0.20)0.15 (0.11, 0.19)
 EQ-5D-3L Self-Care0.12 (0.09, 0.16)0.12 (0.09, 0.16)
 FPIc Body Care− 0.26 (− 0.30, − 0.21)−0.22 (− 0.27, − 0.18)
 FPI Maintain Household− 0.28 (− 0.33, − 0.24)−0.26 (− 0.30, − 0.21)
 FPI Physical Exercise− 0.28 (− 0.32, − 0.23)−0.24 (− 0.29, − 0.20)
Healthcare Utilization
 Oxygen Therapy0.05 (0.00, 0.09)0.04 (0.00, 0.08)
 X-ray0.07 (0.02, 0.12)0.05 (0.01, 0.10)
 MRI0.03 (− 0.02, 0.08)0.02 (− 0.02, 0.07)
 CT0.04 (0.01, 0.08)0.03 (0.02, 0.07)
  1. *r = correlation coefficient computed with longitudinal random effects model. 95% CI 95% confidence interval. SF-36 Short Form Healthy Survey-36 Version 2, HADS Hospital Anxiety and Depression Scale, FPI Functional Performance Inventory collected during ALTOS only, MRI magnetic resonance imaging, CT computed tomography