Pre-test and post-test probabilities of the risk scoring model.

Johanes Edy Siswanto (14564491)
Asri C. Adisasmita (14564494)
Sudarto Ronoatmodjo (14564497)
Peter H. Dijk (12883810)
Arend F. Bos (7330025)
Florence Manurung (13181097)
Pieter J. J. Sauer (12883804)

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Publication date

February 2023

DOI

10.1371/journal.pone.0281284.g001

Publisher

Public Library of Science (PLoS)

Abstract

Calculation of post-test probabilities using likelihood ratio. Pre-test probability = p = (TP+FN)/(TP +FP + FN +TN) = 0.47. Pre-test odd = p/1-p = 0.47/0.53 = 0.89. Post-test odds = pre-test odds x likelihood ratio. Post-test odds = o = 0.89 x 3.7 = 3.3. Post-test probability = o/(1 +o) = 3.3/4.3 = 0.77.</p