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The UK national evaluation of the development and impact of Early Intervention Services (the National EDEN studies): study rationale, design and baseline characteristics

National EDEN aims to evaluate the implementation and impact on key outcomes of somewhat differently configured Early Intervention Services (EIS) across sites in England and to develop a model of variance in patient outcomes that includes key variables of duration of untreated psychosis (DUP), fidelity to the EIS model and service engagement. The cohort is being followed up for two further years as patients are discharged, to observe the stability of change and the impact of the discharge settings.