@Article{info:doi/10.2196/jmir.1776,
author="Hedman, Erik
and Furmark, Tomas
and Carlbring, Per
and Lj{\'o}tsson, Brj{\'a}nn
and R{\"u}ck, Christian
and Lindefors, Nils
and Andersson, Gerhard",
title="A 5-Year Follow-up of Internet-Based Cognitive Behavior Therapy for Social Anxiety Disorder",
journal="J Med Internet Res",
year="2011",
month="Jun",
day="15",
volume="13",
number="2",
pages="e39",
keywords="Internet; cognitive behavior therapy; anxiety disorders; social anxiety disorder; 5-year follow-up",
abstract="Background: Internet-based cognitive behavior therapy (CBT) has been shown to be a promising method to disseminate cognitive behavior therapy for social anxiety disorder (SAD). Several trials have demonstrated that Internet-based CBT can be effective for SAD in the shorter term. However, the long-term effects of Internet-based CBT for SAD are less well known. Objective: Our objective was to investigate the effect of Internet-based CBT for SAD 5 years after completed treatment. Method: We conducted a 5-year follow-up study of 80 persons with SAD who had undergone Internet-based CBT. The assessment comprised a diagnostic interview and self-report questionnaires. The main outcome measure was the Liebowitz Social Anxiety Scale-Self-Report (LSAS-SR). Additional measures of social anxiety were the Social Interaction Anxiety Scale (SIAS) and the Social Phobia Scale (SPS). Attrition rates were low: 89{\%} (71/80) of the participants completed the diagnostic interview and 80{\%} (64/80) responded to the questionnaires. Results: Mixed-effect models analysis showed a significant effect of time on the three social anxiety measures, LSAS-SR, SIAS, and SPS (F3,98-102 = 16.05 - 29.20, P < .001) indicating improvement. From baseline to 5-year follow-up, participants' mean scores on the LSAS-SR were reduced from 71.3 (95{\%} confidence interval [CI] 66.1-76.5) to 40.3 (95{\%} CI 35.2 - 45.3). The effect sizes of the LSAS-SR were large (Cohen's d range 1.30 - 1.40, 95{\%} CI 0.77 - 1.90). Improvements gained at the 1-year follow-up were sustained 5 years after completed treatment. Conclusions: Internet-based CBT for SAD is a treatment that can result in large and enduring effects. Trial registration: Clinicaltrials.gov NCT01145690; http://clinicaltrials.gov/ct2/show/NCT01145690 (Archived by WebCite at http://www.webcitation.org/5ygRxDLfK) ",
issn="1438-8871",
doi="10.2196/jmir.1776",
url="http://www.jmir.org/2011/2/e39/",
url="https://doi.org/10.2196/jmir.1776",
url="http://www.ncbi.nlm.nih.gov/pubmed/21676694"
}
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