Table of Contents
Evidence-based Medicine
Study Design
Typical Data Collection
Randomized Trial
Randomized Clinical Trials
Cohtort Study
Cohort studies
Case-Control Study
Case-control studies
Cross-sectional Study
Cross-sectional studies
Statistical Summaries
GERD Treatment: 2 x 2 Table
Odds Ratios (OR)
Odds Ratio
Relative Risk (RR) (also called Risk Ratio)
Relative Risk (Risk Ratio)
Relative Rate Reduction (RRR)
Relative Rate Reduction
Absolute Rate Reduction (ARR)
Absolute Rate Reduction
Number Needed to Treat (NNT)
Number Needed to Treat
Critical Appraisal
Example Scenario
PICO-Formatted Question
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Author: Robert W. Baer, Ph.D.
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