• Peter Selby, Gerald Brosky, Paul I Oh, Vincent Raymond, and Suzanne Ranger.
• Addictions Program, Centre for Addiction and Mental Health, 100 Stokes St,, 33 Russell Street, Toronto, ON M6J 1H4, Canada. peter.selby@camh.ca
• Bmc Med Res Methodol. 2012 Jul 23; 12: 101.

BackgroundNumerous explanatory randomized trials support the efficacy of chronic disease interventions, including smoking cessation treatments. However, there is often inadequate adoption of these interventions for various reasons, one being the limitation of generalizability of the explanatory studies in real-world settings. Randomized controlled trials can be rated as more explanatory versus pragmatic along 10 dimensions. Pragmatic randomized clinical trials generate more realistic estimates of effectiveness with greater relevance to clinical practice and for health resource allocation decisions. However, there is no clear method to scale each dimension during the trial design phase to ensure that the design matches the intended purpose of the study.MethodsWe designed a pragmatic, randomized, controlled study to maximize external validity by addressing several barriers to smoking cessation therapy in ambulatory care. We analyzed our design and methods using the recently published 'Pragmatic-Explanatory Continuum Indicatory Summary (PRECIS)' tool, a qualitative method to assess trial design across 10 domains. We added a 20-point numerical rating scale and a modified Delphi process to improve consensus in rating these domains.ResultsAfter two rounds of review, there was consensus on all 10 domains of study design. No single domain was scored as either fully pragmatic or fully explanatory; but overall, the study scored high on pragmatism.ConclusionsThis addition to the PRECIS tool may assist other trial designers working with interdisciplinary co-investigators to rate their study design while building consensus.

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