External validity concerns?

External validity concerns?

• A. Rigor of randomization
• B. Control of confounding
• C. Generalizability of results to other settings
• D. Statistical power

Answer: (C)

External validity is about whether the study’s findings can be applied beyond the exact conditions in which the study was conducted. It asks if the results would hold for other people, in different settings, and at different times. Saying that the results are generalizable to other settings captures this idea precisely: it focuses on applying what was found here to other clinics, populations, or circumstances. For example, a physical therapy intervention tested in a university clinic should be evaluated for external validity to see if it would work similarly in community clinics or with older patients. Rigor of randomization and control of confounding affect internal validity, ensuring that the observed effect is truly due to the intervention within the study. Statistical power concerns whether the study was large enough to detect an effect, not whether the effect would generalize to other settings. In short, external validity is about generalizability to populations and settings beyond the study.

External validity is about whether the study’s findings can be applied beyond the exact conditions in which the study was conducted. It asks if the results would hold for other people, in different settings, and at different times. Saying that the results are generalizable to other settings captures this idea precisely: it focuses on applying what was found here to other clinics, populations, or circumstances. For example, a physical therapy intervention tested in a university clinic should be evaluated for external validity to see if it would work similarly in community clinics or with older patients.

Rigor of randomization and control of confounding affect internal validity, ensuring that the observed effect is truly due to the intervention within the study. Statistical power concerns whether the study was large enough to detect an effect, not whether the effect would generalize to other settings. In short, external validity is about generalizability to populations and settings beyond the study.