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).
Diagnostic Test - calculates the Sensitivity, Specificity, PPV, NPV, LR+, and LR-
Prospective Study - calculates the Relative Risk (RR), Absolute Relative Risk (ARR), and Number Needed to Treat (NNT)
Case-control Study - calculates the Odds Ratio (OR)
Randomized Control Trial (RCT) - calculates the Relative Risk Reduction (RRR), ARR, and NNT