Mindfulness-enhanced internet-based cognitive behavioural therapy for anxiety and depression: Outcomes in routine care.

Background: Clinical trials support the efficacy of mindfulness-enhanced, internet-based cognitive behavioural therapies (CBT) in reducing anxiety and depression symptom severity. However, it is unclear how effective these interventions are when delivered in routine clinical care settings. This study investigated the utilisation and treatment outcomes of an online mindfulness-enhanced CBT program in the general Australian community.

Methods: Over a one-year study period, 2187 adults commenced the online mindfulness-enhanced CBT program. The program consisted of six sequential lessons to be completed within 90 days.

Participants: (mean age= 39 ± 14 years, 68 % female) completed measures of symptom severity for anxiety, depression, and psychological distress at pre-, mid- and post-treatment. Treatment effects were assessed via intention-to-treat linear mixed models with Hedges' g effect size calculations.

Results: From pre- to post-treatment, the mindfulness-enhanced CBT program was associated with medium and large effect sized reductions in generalised anxiety symptom severity (g = 0.80, 95%CI: 0.74-0.86), depression symptom severity (g = 0.74, 95%CI: 0.68-0.80), and psychological distress (g = 0.97, 95%CI: 0.90-1.03). Program adherence was modest with approximately 30 % of participants completing all six lessons of the program.

Limitations: This study is limited by its lack of a comparator condition, longer-term follow-up, and assessment of the reasons for participant non-adherence. The relative acceptability and effectiveness of mindfulness versus CBT components was not examined.

Conclusion: This study supports the effectiveness of mindfulness-enhanced iCBT for symptoms of anxiety and depression when delivered in a routine care setting under the supervision of community health care practitioners.