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External validity, generalisability, applicability and directness: a brief primer.

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Summary
This summary is machine-generated.

External validity determines if study results apply to other patients. It includes generalisability (sample to population) and applicability (study findings to individual patient care), with applicability often posing challenges for clinicians.

Keywords:
public healthquality in health care

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Area of Science:

  • Clinical Research Methodology
  • Evidence-Based Practice
  • Health Services Research

Background:

  • External validity assesses the extent to which research findings can be applied to different populations or settings.
  • This construct encompasses two distinct concepts: generalisability and applicability.
  • Understanding these concepts is crucial for the effective translation of research into clinical practice.

Purpose of the Study:

  • To clarify the distinct concepts of generalisability and applicability within external validity.
  • To identify challenges associated with applying research findings in real-world clinical scenarios.
  • To highlight the impact of low applicability on the certainty of evidence for patient care.

Main Methods:

  • Conceptual analysis of external validity and its components.
  • Distinction between generalisability (sample to population) and applicability (study to patient).
  • Examination of the implications for clinicians, guideline developers, and policymakers.

Main Results:

  • External validity is composed of generalisability and applicability.
  • Generalisability concerns extending findings from a study sample to its source population.
  • Applicability concerns using study inferences for the care of specific patients, which clinicians often find challenging.

Conclusions:

  • Applicability is a key challenge in external validity, particularly for clinical decision-making.
  • Low applicability can reduce the certainty of evidence due to indirectness.
  • Clearer understanding and assessment of applicability are needed to improve the use of research in patient care.