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Evidence-Based Practice Tutorial

An introduction to evidence-based practice (EBP).

How to Calculate...

P-values

P-values and Type I Error
Terry Shaneyfelt (5 min video)

Number Needed to Treat

How to Calculate the Number Needed to Treat
Terry Shaneyfelt (3 min video)
The NNT Tutorial
Grahm Walker (4 min video)
Number Needed to Treat
Phillip Sedgewick. BMJ 2010;341:c5614

Absolute Risk Reduction, Relative Risk Reduction, Relative Risk

How to Calculate Relative Risk
Terry Shaneyfelt (3 min video)
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 1995 Mar 15;152(6):813.

Odds Ratios

How to Calculate an Odds Ratio
Terry Shaneyfelt (3 min video)
Odds Ratios
Philip Sedgwick. BMJ 2010;341:c4414

Intention-to-Treat

Intention-to-Treat Analysis: What It Is and Why Is It Important?
Terry Shaneyfelt (5 min video)
What is Intention-to-Treat Analysis?
Allan Shaughnessy (1 min video)
What is the Intention-to-Treat Analysis?
Philip Sedgewick BMJ 2013;346:f3662

Forest Plots

How to Interpret a Forest Plot
Terry Shaneyfelt (5 min video)
Interpreting and Understanding Meta-Analysis Graphs: A Practical Guide
Aust Fam Physician. 2006 Aug;35(8):635-8. PubMed PMID: 16894442

Confidence Intervals

Confidence Intervals
Terry Shaneyfelt (5 min video)
Basic Statistics for Clinicians: Interpreting Study Results: Confidence Intervals
CMAJ. 1995 Jan 15;152(2):169-73.

Sensitivity, Specificity and Likelihood ratios

Sensitivity & Specificity
H. Gilbert Welch (8 min video). The Dartmouth Institute for Health Policy & Clinical Practice.
How to Calculate Sensitivity
Terry Shaneyfelt (4 min video)
How to Calculate Specificity
Terry Shaneyfelt (3 min video)
What are Likelihood Ratios and How Are They Used
Terry Shaneyfelt (10 min video)

More

Sources for Likelihood Ratio

Diagnosis (LR) Reviews
Includes interactive nomogram.

JAMAevidence Calculators

JAMAevidence Calculators
Covers therapy, harm and diagnosis. Requires Flash Player.

EBP Calculators

Nomogram for Body Mass Index Handout
A nomogram is a graphic that allows for (approximate) visualization of the value of a mathematical function.
Number Needed to Treat (NNT)
EBM and Decision Tools (Interactive Diagnostic Tool)

BMJ Statistical Notes series by DG Altman

Impact of peer review on reports of randomised trials published in open peer review journals: retrospective before and after study.

Grimes and Schulz series on statistics in Lancet

Last Updated: Aug 7, 2020 1:40 PM
URL: https://libguides.pcom.edu/ebp_tutorial
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Subjects: Osteopathic Medicine, Physical Therapy, Physician Assistant Studies