Depression is a common mental disorder with a negative impact on mental well-being, quality of life, and social and work-related functioning both in the short and longer term. Additionally, depression is associated with increased morbidity, mortality, health care utilization and health care costs. On a population level, depression is one of the most costly diseases. The economic costs of depression were estimated at €136.3 billion (EU25) in 2010 in the EU and are still rising. European health care systems face the challenge of improving access to cost-effective treatments while simultaneously working to sustain budgetary stability in times of economic austerity.~Internet-based depression treatment appears a very promising alternative to current routine depression treatment strategies. Meta-analyses have demonstrated the clinical effectiveness and potential cost-effectiveness of Internet-based treatment for depression in controlled research setting. Internet-based treatment thus has the potential to keep depression treatment affordable, as it enables mental health care providers to reach out to large populations needing depression treatment at a better cost-effectiveness than those of standard treatment as usual (TAU), but with similar levels of clinical efficacy and quality of care.~The trials will be conducted in 8 European countries. In Spain the trial will be carried out in routine primary, comparing the clinical and cost-effectiveness of CBT and TAU for adults with major depressive disorder (MDD). Respondents will be followed until 12 months after baseline (measures will be taken at BL, 3 months, 6 months and 12 months).
To compare the clinical and cost-effectiveness of blended Cognitive Behavioural Therapy (CBT) for adults with major depressive disorder (MDD) with treatment as usual (TAU) in Spanish population.