“…Fourth, we were surprised by our results, which consistently indicated that approximately 80% of participants completed the treatment protocols with a magnitude of clinical improvement at least as large as those we typically observed at our specialist tertiary face-to-face outpatient treatment facility for anxiety disorders (McEvoy, 2007). Specifi cally, using the same outcome measures across services, we consistently obtained mean effect sizes on primary outcome measures of Cohen's d ≥ 1.0, which were consistent with results from other research teams evaluating disorder-specifi c iPT interventions (Andersson et al, 2006;Berger et al, 2011;Carlbring et al, 2007;Carlbring et al, 2005;Furmark et al, 2009;Kiropoulos et al, 2008;Paxling et al, 2011;Richards, Klein, & Austin, 2006). Fifth, consistent with other reports, we noticed that effective treatment of the principal diagnosis often reduced symptoms in comorbid conditions (Johnston, Titov, Andrews, Dear, & Spence, accepted;Titov, Gibson, Andrews, & McEvoy, 2009).…”