Two techniques for teaching the estimation of prior probabilities.

Abstract:

BACKGROUND:Studies indicate that practicing clinicians do not employ quantitative techniques in diagnosis. If evidence-based approaches to clinical care are to succeed, there is a need to develop pedagogical tools to introduce the relevant techniques in clinical medicine. DESCRIPTION:This article describes 2 heuristic techniques that can be used by clinical teachers to introduce residents and medical students to the practice of estimating prior probabilities in diagnostic reasoning. The techniques are the probability pie and the probability dollar. The techniques require learners to divide either a pie or a dollar according to the probability they assign in the differential diagnosis. The techniques also introduce related ideas such as likelihood ratios, posterior probabilities, diagnostic accuracy and intra- and interrater variability. EVALUATION:An example of a 60-year-old man presenting with chest pain is presented to illustrate the technique. CONCLUSION:This article presents a simple and clinically relevant method of introducing important concepts in quantitative reasoning. More systematic evaluation is required to assess its effectiveness.

journal_name

Teach Learn Med

authors

Upshur RE

doi

10.1207/S15328015TLM1203_4

keywords:

subject

Has Abstract

pub_date

2000-07-01 00:00:00

pages

141-4

issue

3

eissn

1040-1334

issn

1532-8015

journal_volume

12

pub_type

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