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Trajectories of change and long-term outcomes in a randomisedcontrolled trial of internet-based insomnia treatment to preventdepression

Published online by Cambridge University Press:  02 January 2018

Philip J. Batterham*
Affiliation:
Centre for Mental Health Research, Research School of Population Health, The Australian National University, Canberra, ACT, Australia
Helen Christensen
Affiliation:
Black Dog Institute, University of New South Wales, Sydney, NSW, Australia
Andrew J. Mackinnon
Affiliation:
Black Dog Institute, University of New South Wales, Sydney, NSW, Australia
John A. Gosling
Affiliation:
Centre for Mental Health Research, Research School of Population Health, The Australian National University, Canberra, ACT, Australia
Frances P. Thorndike
Affiliation:
BeHealth Solutions, Charlottesville, VA, USA
Lee M. Ritterband
Affiliation:
Behavioural Health and Technology Lab, Department of Psychiatry and Neurobehavioural Sciences, School of Medicine, University of Virginia, Charlottesville, VA, USA
Nick Glozier
Affiliation:
Brain and Mind Centre, University of Sydney, Sydney, NSW, Australia
Kathleen M. Griffiths
Affiliation:
Research School of Psychology, The Australian National University, Canberra, ACT, Australia
*
Philip J. Batterham, Centre for Mental Health Research,Research School of Population Health, The Australian National University,Canberra, Acton ACT 2601, Australia. E-mail: philip.batterham@anu.edu.au
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Abstract

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Background

Insomnia treatment using an internet-based cognitive–behavioural therapy for insomnia (CBT-I) program reduces depression symptoms, anxiety symptoms and suicidal ideation. However, the speed, longevity and consistency of these effects are unknown.

Aims

To test the following: whether the efficacy of online CBT-I was sustained over 18 months; how rapidly the effects of CBT-I emerged; evidence for distinct trajectories of change in depressive symptoms; and predictors of these trajectories.

Method

A randomised controlled trial compared the 6-week Sleep Healthy Using the Internet (SHUTi) CBT-I program to an attention control program. Adults(N=1149) with clinical insomnia and subclinical depression symptoms were recruited online from the Australian community.

Results

Depression, anxiety and insomnia decreased significantly by week 4 of the intervention period and remained significantly lower relative to control for >18 months (between-group Cohen's d=0.63, 0.47, 0.55, respectively, at 18 months). Effects on suicidal ideation were only short term. Two depression trajectories were identified using growth mixture models: improving (95%) and stable/deteriorating (5%) symptoms. More severe baseline depression, younger age and limited comfort with the internet were associated with reduced odds of improvement.

Conclusions

Online CBT-I produced rapid and long-term symptom reduction in people with subclinical depressive symptoms, although the initial effect on suicidal ideation was not sustained.

Information

Type
Paper
Copyright
Copyright © The Royal College of Psychiatrists 2017
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