Psychometric Properties

Scoring and Interpretation Guidelines

Sensitivity: 1.0 (Blanchard et al., 1986)

Specificity: .91 (Blanchard et al., 1986)

  • Inconsistent findings from two studies, better statistics in combat veterans than community-based study (Keane et al., 2000)

 

Sensitivity: >.8, often >.9 (Weathers et al., 2001)

Specificity: >.8, often >.9 (Weathers et al., 2001)

Kappa: >.7 (criterion: SCID; Weathers et al., 2001)

Internal consistency (alpha): typically .8–.9 for three clusters and for entire syndrome (Weathers et al., 2001)

Test-retest reliability: .9–.98 (Weathers et al., 1992)

Interrater reliability: ≥.9 (continuous); comparable, up to 100% (diagnosis) (Weathers et al., 2001)

  • ≥.7 (typically .8–.9) correlations with self-report PTSD measures (Mississippi, Impact of Event Scale [IES], PTSD Checklist [PCL], Davidson Trauma Scale [DTS], Minnesota Multiphasic Personality Inventory [MMPI-2] Keane Scale, Structured Clinical Interview for PTSD [SCID-PTSD]) (for review: Weathers et al., 2001)

  • Frequency scores: 0–68

  • Intensity scores: 0–136

  • Rating scales summed to create 9-point (0–8) severity score for each symptom

  • Total Severity Score:

0–19: asymptomatic/few symptoms

20–39: mild PTSD/subthreshold

40–59: moderate PTSD/threshold

60–79: severe PTSD symptoms

≥80: extreme PTSD symptoms

  • Clinically significant change: ≥15 pt change in CAPS total severity score

  • Symptom Endorsement Scoring Rules:

F1/I2: freq. ≥“1”, inten. ≥2

Rule of 2: severity ≥2

Rule of 3: severity ≥3

Rule of 4: severity ≥4

  • Diagnostic Rules

“B” ≥1, “C” ≥3, “D” ≥2

TSEV65: total severity ≥65

  • Nine diagnostic scoring rules yield different prevalence rates (research setting: 26–49%, clinical: 47–82%) (Weathers et al., 1999)

  • F1/I2 most lenient in clinical sample, second in research, clinician rating-based rules most stringent (Weathers et al., 1999)

  • Explicit reporting and use of several scoring rules recommended

  • Lenient rules recommended for screening purposes, while stringent rules appropriate for confirming diagnosis or creating case groups (Weathers et al., 1999)



The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement