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Evidence Based Medicine (Practice): Calculate Results
Welcome!
EBM/Practice Pyramid & Tutorials
Health/Med Databases
Calculate Results
EBP Calculators
Diagnostic Test Calculator
This calculator can determine diagnostic test characteristics (sensitivity, specificity, likelihood ratios) and/or determine the post-test probability of disease given given the pre-test probability and test characteristics
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by Alan Schwartz
Nomogram Handout
Nomogram for interpreting diagnostic test results (likelihood ratio)
EBM and Decision Tools (Interactive Diagnostic Tool)
by Alan Schwartz
Sensitivity, Specificity and Likelihood Ratios
Sensitivity & specificity
H. G. Welch (8 minute video)
How to calculate sensitivity
Terry Shaneyfelt (4 minute video)
How to calculate specificity
Terry Shaneyfelt (3 minute video)
Likelihood Ratios
From the Centre for Evidence-Based Medicine, University of Oxford
Explaining the Results
Absolute Risk Reduction, Relative Risk Reduction, Relative Risk
Basic statistics for clinicians: Assessing the effects of treatment measures of association
CMAJ. 1995 Feb 1;152(3):351-7. Erratum in: Can Med Assoc J 1195 Marc 15; 152(6): 813
Odds Ratios
Odds ratios
BMJ 2010;341:c4414 Sedgwick, P.
Intention to Treat
What is intention to treat analysis?
BMJ 2013;346:f3662 Sedgwick, P.
Sources for Likelihood Ratios
Likelihood ratios from thennt.com (NNT)
Diagnostic/likelihood ratio reviews, arranged by medical specialty, organ system, and alphabetically.
Pretest Probabilities and Likelihood Ratios for Clinical Findings
From JAMAevidence, The Rational Clinical Examination - quick reference
BMJ Statistical Notes Series by DG Altman
PubMed Search (automatic)- Statistical Series in BMJ
Hazard Ratios
Interpreting Hazard Ratios
Size Matters: Sample Size & Effect Size
Sample Size: A Practical Introduction
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