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Ohio University Libraries

Evidence-based Practice in Healthcare

This guide is designed to assist health care professionals and students become effective and efficient users of the medical literature.

Where to find Evidence-based Materials

  • Diagnostic Test Calculator
  • Risk Reduction Calculator
  • Evidence Based Toolkit
  • CEBM Statistics Calculator - This multi-functional tool allows you to calculate data for several different types of evidence--diagnostic tests, prospective studies, case control studies, and randomized controlled trials (RCTs).
  • Chi-Square Calculator
  • Likelihood Ratio (LR) Calculations - The LR is used to assess how good a diagnostic test is and to help in selecting an appropriate diagnostic test(s) or sequence of tests. They have advantages over sensitivity and specificity because they are less likely to change with the prevalence of the disorder, they can be calculated for several levels of the symptom/sign or test, they can be used to combine the results of multiple diagnostic test and the can be used to calculate post-test probability for a target disorder.
  • Odds Ratio - In statistics, the odds ratio (usually abbreviated "OR") is one of three main ways to quantify how strongly the presence or absence of property A is associated with the presence or absence of property B in a given population.
  • Odds Ratio to NNT Converter - To convert odds ratios to NNTs, enter a number that is > 1 or < 1 in the odds ratio textbox and a number that is not equal to 0 or 1 for the Patient's Expected Event Rate (PEER). After entering the numbers, click "Calculate" to convert the odds ratio to NNT.
  • One Factor ANOVA
  • Relative Risk Calculator - In statistics and epidemiology, relative risk or risk ratio (RR) is the ratio of the probability of an event occurring (for example, developing a disease, being injured) in an exposed group to the probability of the event occurring in a comparison, non-exposed group.
  • Two Factor ANOVA