Table 8.4Sensitivity, specificity and predictive power of screening tests for PTSD

ReferenceInstrumentNumber of itemsSamplePrevalence of PTSD (%)SensitivitySpecificityPositive predictive powerNegative predictive powerOverall efficiency
Neal et al (1994)IES/cut-off 35115Mixed trauma (n=70)510.890.880.890.880.89
Wohlfarth et al (2003)IES/cut-off 3515Crime victims (n=79)2130.890.940.670.990.94
Meltzer-Brody et al (1999)SPAN/cut-off 514Mixed trauma (n=121)460.840.910.890.870.88
Meltzer-Brody et al (1999)SPAN/cut-off 54Mixed trauma (n=122)510.770.820.810.780.80
Brewin et al (2002)TSQ/cut-off 6110Rail crash survivors (n=41)2340.860.930.860.930.90
Brewin et al (2002)TSQ/cut-off 610Crime victims (n=157)2270.760.970.910.920.92
Mean performance of all measures0.830.850.700.900.86

IES, Impact of Event Scale; SPAN, Startle, Physiological arousal, Anger and Numbness items from the Davidson Trauma Scale; TSQ, Trauma Screening Questionnaire.

1

Cut-off value determined post hoc.

2

Administered within 1 year of trauma.

Cut-off value determined post hoc.

Administered within 1 year of trauma.

From: 8, Predictors of PTSD and screening for the disorder

Cover of Post-Traumatic Stress Disorder
Post-Traumatic Stress Disorder: The Management of PTSD in Adults and Children in Primary and Secondary Care.
NICE Clinical Guidelines, No. 26.
National Collaborating Centre for Mental Health (UK).
Leicester (UK): Gaskell; 2005.
Copyright © 2005, The Royal College of Psychiatrists & The British Psychological Society.

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