COBRA (Cost and Outcome of BehaviouRal Activation): a Randomised Controlled Trial of Behavioural Activation versus Cognitive Behaviour Therapy for Depression
A large trial is testing whether a simpler, cheaper talking therapy for depression works as well as the current gold standard. The COBRA trial compares Behavioural Activation (BA)—which helps people change what they do, not what they think—against Cognitive Behaviour Therapy (CBT) in 440 adults with major depression. This matters because CBT, while effective, is complex and expensive to deliver. It requires highly trained specialists, limiting how many patients can access it on the NHS. If BA works just as well, it could be delivered by less specialised mental health workers, freeing up resources and reaching more people. If the trial shows BA is non-inferior to CBT and costs less, the NHS could adopt BA as a first-line treatment for depression. That would mean faster access to therapy for patients, lower treatment costs, and a simpler model to roll out across community mental health services. The study also tracks quality of life and days free from depression, giving a full picture of what patients gain.
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Background: clinical depression is one of the most common and debilitating of the psychiatric disorders, a major health problem which causes substantial disability and set to become the second largest cause of global disability by 2020. Cognitive Behaviour Therapy (CBT) is the psychological treatment with most evidence of effectiveness recommended by NICE, but its complexity and cost may limit its dissemination to applied NHS settings. Behavioural Activation (BA), a psychological treatment alleviating depression by focusing directly on changing behaviour, may provide all the clinical benefits of CBT, with fewer limitations. Question: What are the clinical effects and costs of BA compared to CBT for depressed adults at 12 and 18 months Method: Non-inferiority, patient level randomised controlled trial, including clinical, economic and process evaluations Sample: 440 people aged 18 and older with DSM Major Depressive Disorder Interventions: 20 sessions over 16 weeks with the option of four additional booster sessions of either: (a) Behavioural Activation (BA) delivered by mental health workers trained and competent in BA but with no prior specialist training in psychological interventions, (b) Cognitive Behaviour Therapy (CBT) delivered by senior metal health workers with specialist training in the delivery of CBT. Outcomes: depression severity (PHQ9) at 12 & 18 months; direct and indirect costs of treatment and disease burden; health-state utility (EQ5D); DSM depression status and depression free days; Health Related Quality of Life (SF-36); the joint distribution of incremental mean costs and effects, in terms of QALYs using the EQ-5D measure of health-related quality of life. Conclusions: if CBT and BA are equally effective and COBRA shows a cost benefit in terms of BA, then then BA may be preferable because its simplicity in delivery and mechanism of change allows for more cost effective delivery by less specialised NHS mental health workers.
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