I recently began working on a calculator for biostatistics and evidenced-based medicine. While there are certainly valid complaints about the field—I’ll let others be the complainers—EBM has pulled medicine out of the dark ages into a more scientific discipline. To help with calculations regarding diagnostic procedures, I’ve put together this Excel chart that can give sensitivity, specificity, predictive values, likelihood ratios, 95% confidence intervals, and a graph of the pre-test vs post-test probabilities.
Simply enter the appropriate information into the 2×2 table and the program will take care of the rest. If you wish to print the form, only print the first page. The rest of the chart contains a series of calculations.
In the future I plan to continually add to the EBM calculator to include exposures.