Evidence-appraisal glossary
Real-world evidence
Real-world evidence (RWE) is clinical evidence about a treatment's benefits or risks that comes from analyzing real-world data, information collected during routine care rather than in a controlled trial. Sources include electronic health records, insurance claims, disease registries, and data from apps or wearable devices.
Also called: RWE, real-world data, real-world study.
Real-world evidence (RWE) is generated by analyzing real-world data (RWD), data gathered outside the tightly controlled setting of a randomized trial: electronic health records, billing and insurance claims, product and disease registries, pharmacy records, and patient-generated data from apps or wearables. Regulators including the FDA and EMA increasingly use RWE to study how treatments perform in everyday practice, across broader and more diverse populations than trials typically enroll.
When reading an RWE study, its strength depends on design and data quality. Ask: was the comparison group chosen to be genuinely similar, or does confounding by indication distort the result? Was the outcome recorded reliably in the source records? Because patients were not randomized, unmeasured differences between groups can masquerade as treatment effects. Well-conducted RWE (a pre-specified protocol, appropriate statistical adjustment, sensitivity analyses) complements trials by testing external validity and long-term or rare outcomes; weak RWE simply repackages observational bias as reassurance.
This is a plain-language methodology definition for reading research. It is general education, not medical advice.