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Behav Res Ther. 2009 Oct;47(10):848-50. doi: 10.1016/j.brat.2009.06.012. Epub 2009 Jun 27.

Long-term outcome of Internet-delivered cognitive-behavioural therapy for social phobia: a 30-month follow-up.

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Linköping University, Department of Behavioural Sciences and Learning, Linkoping, Sweden.


Internet-delivered guided cognitive behaviour therapy for social anxiety disorder has been found to generate promising short-term results, up to one year posttreatment. No study has however documented longer follow-up periods. In this 30-month follow-up we contacted 57 participants from the original study of which 77.2% (44/57) responded to the Internet-administered outcome measures and 66.7% (38/57) completed a telephone interview. Results showed large pretreatment to follow-up within-group effect sizes for the primary outcome measures (Cohen's d 1.10-1.71), and a majority (68.4%; 26/38) reported improvements in the interview. The findings suggest that the long-term effects seen in previous live treatment CBT trials can occur in Internet-delivered treatment as well.

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