Pragmatic Clinical Trial Resources-Pragmatic Clinical Trials and Real-World Evidence: An Introduction

Pragmatic Clinical Trials and Real-World Evidence: An Introduction

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Pragmatic clinical trials (PCTs) are designed to close the gap between traditional randomized controlled trials (RCTs) and routine clinical care by testing how well interventions work under real-world conditions. While RCTs typically establish an intervention’s efficacy and safety in highly controlled environments with narrowly defined, often healthier participants, PCTs assess effectiveness in everyday practice across diverse patients, comorbidities, and healthcare settings.<br /><br />The article contrasts explanatory trials (RCTs) and pragmatic trials across purpose, population, setting, and outcomes. RCTs use strict eligibility criteria, specialized research sites, and tightly standardized protocols to determine whether an intervention works “in theory,” often focusing on biological or physiological endpoints. However, these features can limit external validity and may overestimate benefits or miss harms seen in broader populations. In contrast, PCTs are conducted in typical care settings (e.g., community clinics), enroll representative patients, allow flexibility in how care is delivered, and frequently use patient-centered outcomes such as quality of life, functional status, or hospitalization rates. Many studies fall on a continuum between these approaches and may combine design elements to answer practical clinical or policy questions, including comparisons among existing treatments or decentralized trial activities.<br /><br />To help investigators judge how pragmatic a trial design is, the Pragmatic-Explanatory Continuum Indicator Summary (PRECIS-2) scores trials across nine domains (e.g., eligibility, recruitment, setting, flexibility, follow-up, outcomes, analysis), ranging from very explanatory to very pragmatic.<br /><br />An example PCT design includes enrolling all hypertension patients in a primary care clinic, comparing educational or nursing interventions with usual care while stratifying participants by baseline risk. The paper concludes that RCTs offer strong internal validity and mechanism-focused insights, whereas PCTs provide more generalizable evidence but are harder to manage due to real-world complexity and confounding.

Keywords

pragmatic clinical trials

PCTs

randomized controlled trials

explanatory vs pragmatic trials

real-world evidence

external validity

patient-centered outcomes

PRECIS-2

trial design continuum

hypertension primary care intervention