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We examined changes in avoidant and dependent personality disorder
dimensions, and pre-treatment and in-treatment factors associated with
such changes in 77 patients,randomized to medication-free residential
cognitive (CT) or residential interpersonal therapy for social phobia.
Personality disorders and personality dimensions according to the
Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition
(DSM-IV) were assessed at pre-treatment and at one-year post-treat-
ment. Both treatments were associated with a decrease in avoidant and
dependent personality dimensions; dependent dimension decreased
more in CT. Changes in cognitive factors predicted changes in both
personality dimensions, whereas changes in symptoms or interper-
sonal factors did not. Change in the cognitive factor estimated cost
was the most powerful predictor in the avoidant dimension, as it was
the only predictor that remained significant in the forward regression
analyses. Change in the cognitive factor estimated cost, and treatment
were the most powerful predictors of change in the dependent dimen-
sion. Pre-treatment use of anxiolytics predicted larger changes in both
PD dimensions.