title: Usage and longitudinal effectiveness of a Web-based self-help cognitive behavioral therapy program for panic disorder.
abstract: BACKGROUND
  Anxiety disorders are common problems that result in enormous suffering and economic costs. The efficacy of Web-based self-help approaches for anxiety disorders has been demonstrated in a number of controlled trials. However, there is little data regarding the patterns of use and effectiveness of freely available Web-based interventions outside the context of controlled trials.
  
  
  OBJECTIVE
  To examine the use and longitudinal effectiveness of a freely available, 12-session, Web-based, cognitive behavioral therapy (CBT) program for panic disorder and agoraphobia.
  
  
  METHODS
  Cumulative anonymous data were analyzed from 99695 users of the Panic Center. Usage statistics for the website were examined and a longitudinal survey of self-reported symptoms for people who registered for the CBT program was conducted. The primary outcome measures were self-reported panic-attack frequency and severity at the beginning of each session (sessions 2-12).
  
  
  RESULTS
  Between September 1, 2002 and February 1, 2004, there were 484695 visits and 1148097 page views from 99695 users to the Panic Center. In that same time period, 1161 users registered for the CBT program. There was an extremely high attrition rate with only 12 (1.03%) out of 1161 of registered users completing the 12-week program. However, even for those who remained in the program less than 12 weeks we found statistically significant reductions (P<.002) in self-reported panic attack frequency and severity, comparing 2 weeks of data against data after 3, 6, or 8 weeks. For example, the 152 users completing only 3 sessions of the program reduced their average number of attacks per day from 1.03 (week 2) to 0.63 (week 3) (P<.001).
  
  
  CONCLUSIONS
  Freely available Web-based self-help will likely be associated with high attrition. However, for the highly self-selected group who stayed in the program, significant improvements were observed.
authors.affiliation: Centre for Addiction and Mental Health, Toronto, ON M5T 1R8, Canada. peter_farvolden@camh.net
authors.forename: Peter
authors.initials: P
authors.lastname: Farvolden
authors.forename: Eilenna
authors.initials: E
authors.lastname: Denisoff
authors.forename: Peter
authors.initials: P
authors.lastname: Selby
authors.forename: R Michael
authors.initials: RM
authors.lastname: Bagby
authors.forename: Laura
authors.initials: L
authors.lastname: Rudy
mesh_terms: D000379:Agoraphobia / Q000628:therapy*; D015928:Cognitive Behavioral Therapy / Q000379:methods* / Q000706:statistics & numerical data; D003219:Confidentiality; D006801:Humans; D020407:Internet / Q000706:statistics & numerical data*; D008137:Longitudinal Studies; D016584:Panic Disorder / Q000628:therapy*; D010352:Patient Dropouts; D012648:Self Care; D012657:Self-Help Groups