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Do physicians know when their diagnoses are correct? Implications for decision support and error reduction.

Charles P Friedman1, Guido G Gatti, Timothy M Franz

  • 1Center for Biomedical Informatics, University of Pittsburgh, Pittsburgh, PA 15213, USA. cpf@cbmi.pitt.edu

Journal of General Internal Medicine
|April 29, 2005
PubMed
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Physician confidence in diagnoses shows only mild alignment with diagnostic correctness, with residents and faculty often overconfident. This suggests diagnostic decision support systems need more than clinician self-assessment.

Area of Science:

  • Medical Education
  • Clinical Decision Making
  • Cognitive Bias in Medicine

Background:

  • Physician diagnostic accuracy is crucial for patient outcomes.
  • Understanding the relationship between diagnostic confidence and accuracy is vital for improving medical practice.
  • Cognitive biases, such as overconfidence, can impact clinical judgment.

Purpose of the Study:

  • To investigate the alignment between physicians' confidence in their diagnoses and the actual correctness of those diagnoses.
  • To examine how clinical experience influences this alignment.
  • To determine the prevalence of overconfidence and underconfidence among physicians at different experience levels.

Main Methods:

  • A prospective, counterbalanced experimental design was employed.

Related Experiment Videos

  • The study involved 72 senior medical students, 72 senior residents, and 72 faculty internists across three academic medical centers.
  • Participants evaluated 36 diagnostically challenging medical cases, generating differential diagnoses and rating their confidence levels.

    • Main Results:

    • A mild alignment (kappa=.314) was observed between diagnostic confidence and correctness across all participants.
    • Residents exhibited overconfidence in 41% of misaligned cases, faculty in 36%, and students in 25%.
    • Even experienced clinicians demonstrated a lack of awareness regarding the correctness of their diagnoses.

    Conclusions:

    • Physician self-awareness of diagnostic accuracy is limited, even among experienced clinicians.
    • Medical decision support systems should not solely depend on clinicians' perceived need for assistance.
    • Interventions to reduce medical errors must consider cognitive biases impacting diagnostic judgment.