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- Diagnostic Test CalculatorThis 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

- Nomogram HandoutNomogram for interpreting diagnostic test results (likelihood ratio)

- EBM and Decision Tools (Interactive Diagnostic Tool)by Alan Schwartz

- Sensitivity & specificityH. G. Welch (8 minute video)
- How to calculate sensitivityTerry Shaneyfelt (4 minute video)
- How to calculate specificityTerry Shaneyfelt (3 minute video)
- Likelihood RatiosFrom the Centre for Evidence-Based Medicine, University of Oxford

**Absolute Risk Reduction, Relative Risk Reduction, Relative Risk**

- Basic statistics for clinicians: Assessing the effects of treatment measures of associationCMAJ. 1995 Feb 1;152(3):351-7. Erratum in: Can Med Assoc J 1195 Marc 15; 152(6): 813

**Odds Ratios **

- Odds ratiosBMJ 2010;341:c4414 Sedgwick, P.

**Intention to Treat**

- What is intention to treat analysis?BMJ 2013;346:f3662 Sedgwick, P.

- 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 FindingsFrom JAMAevidence, The Rational Clinical Examination - quick reference