Topic: Why and what are we controlling…? Reflections on how to design and manage control groups in hybrid effectiveness-implementation trials

In this presentation, Dr. Sevdalis will:

• Offer an overview of the nature of control groups in published effectiveness-implementation hybrid trials in health
• Articulate what is being controlled and with what aims and explore rationales for the choice of controls
• Present illustrative case studies of hybrid trials, demonstrating different considerations in selecting control groups
• Share his personal experiences of setting up and managing control groups, including how to manage potential tensions arising in control arms of hybrid trials

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