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Internet-based cognitive behavioural therapy for subthreshold depression in people over 50 years old: a randomized controlled clinical trial

Published online by Cambridge University Press:  30 April 2007

VIOLA SPEK
Affiliation:
Department of Psychology and Health, Tilburg University, The Netherlands Diagnostic Centre Eindhoven, The Netherlands
IVAN NYKLÍČEK
Affiliation:
Department of Psychology and Health, Tilburg University, The Netherlands
NIELS SMITS
Affiliation:
Department of Clinical Psychology, Vrije Universiteit Amsterdam, The Netherlands
PIM CUIJPERS
Affiliation:
Department of Clinical Psychology, Vrije Universiteit Amsterdam, The Netherlands
HELEEN RIPER
Affiliation:
Trimbos-instituut, Netherlands Institute of Mental Health and Addiction, The Netherlands
JULES KEYZER
Affiliation:
Diagnostic Centre Eindhoven, The Netherlands
VICTOR POP
Affiliation:
Department of Psychology and Health, Tilburg University, The Netherlands Diagnostic Centre Eindhoven, The Netherlands
Corresponding
E-mail address:

Abstract

Background

Subthreshold depression is a highly prevalent condition and a risk factor for developing a major depressive episode. Internet-based cognitive behaviour therapy may be a promising approach for the treatment of subthreshold depression. The current study had two aims: (1) to determine whether an internet-based cognitive behaviour therapy intervention and a group cognitive behaviour therapy intervention are more effective than a waiting-list control group; and (2) to determine whether the effect of the internet-based cognitive behaviour therapy differs from the group cognitive behaviour therapy intervention.

Method

A total of 191 women and 110 men with subthreshold depression were randomized into internet-based treatment, group cognitive behaviour therapy (Lewinsohn's Coping With Depression course), or a waiting-list control condition. The main outcome measure was treatment response after 10 weeks, defined as the difference in pre- and post-treatment scores on the Beck Depression Inventory (BDI). Missing data, a major limitation of this study, were imputed using the Multiple Imputation (MI) procedure Data Augmentation.

Results

In the waiting-list control group, we found a pre- to post-improvement effect size of 0·45, which was 0·65 in the group cognitive behaviour therapy condition and 1·00 within the internet-based treatment condition. Helmert contrasts showed a significant difference between the waiting-list condition and the two treatment conditions (p=0·04) and no significant difference between both treatment conditions (p=0·62).

Conclusions

An internet-based intervention may be at least as effective as a commonly used group cognitive behaviour therapy intervention for subthreshold depression in people over 50 years of age.

Type
Original Article
Copyright
Copyright © Cambridge University Press 2007

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