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Am J Psychiatry 1995; 152:936-938
Copyright © 1995 by American Psychiatric Association
Association of intelligence with severity of posttraumatic stress disorder symptoms in Vietnam Combat veterans
RJ McNally and LM Shin
Department of Psychology, Harvard University, Cambridge, MA 02138, USA.
OBJECTIVE: The purpose of this study was to determine whether intelligence
predicts variance in posttraumatic stress disorder (PTSD) symptoms beyond
that predicted by extent of combat exposure. METHOD: The subjects were 105
male Vietnam combat veterans. They completed the Mississippi Scale for
Combat-Related Posttraumatic Stress Disorder, the Combat Exposure Scale,
and the Shipley Institute for Living Scale, a measure of general
intelligence. Number of years of education was recorded for each subject.
RESULTS: Multiple regression analyses revealed that estimated full-scale IQ
significantly predicted variance in PTSD symptoms beyond that predicted by
extent of combat exposure. The lower a subject's intelligence, the more
severe were his PTSD symptoms. CONCLUSIONS: Cognitive variables may affect
the ability to cope with trauma, thereby affecting whether a person
develops chronic PTSD.
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