• Paul McCrone, Martin Knapp, Judith Proudfoot, Clash Ryden, Kate Cavanagh, David A Shapiro, Sophie Ilson, Jeffrey A Gray, David Goldberg, Anthony Mann, Isaac Marks, Brian Everitt, and Andre Tylee.
• Centre for the Economics of Mental Health, Institute of Psychiatry, King's College London, UK.
• Br J Psychiatry. 2004 Jul 1; 185: 55-62.

BackgroundCognitive-behavioural therapy (CBT) is effective for treating anxiety and depression in primary care, but there is a shortage of therapists. Computer-delivered treatment may be a viable alternative.AimsTo assess the cost-effectiveness of computer-delivered CBT.MethodA sample of people with depression or anxiety were randomised to usual care (n=128) or computer-delivered CBT (n=146). Costs were available for 123 and 138 participants, respectively. Costs and depression scores were combined using the net benefit approach.ResultsService costs were 40 British pounds (90% CI - 28 British pounds to 148 British pounds) higher over 8 months for computer-delivered CBT. Lost-employment costs were 407 British pounds (90% CI 196 British pounds to 586 British pounds) less for this group. Valuing a 1-unit improvement on the Beck Depression Inventory at 40 British pounds, there is an 81% chance that computer-delivered CBT is cost-effective, and it revealed a highly competitive cost per quality-adjusted life year.ConclusionsComputer-delivered CBT has a high probability of being cost-effective, even if a modest value is placed on unit improvements in depression.

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