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. 2021 Jan-Feb;153(1-2):126–131. doi: 10.4103/ijmr.IJMR_3305_20

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Copyright: © 2021 Indian Journal of Medical Research

This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms.

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Fig. 1 — A plot of the post-test probability against the pre-test probability of having COVID-19. The green and orange ribbons represent the 95% confidence interval around these values. The vertical line indicates the pre-test probability or prevalence of COVID-19 (23.3%). Where this vertical line cuts the green and orange lines, those points give the probabilities that if the result of the rapid diagnostic test is negative, then COVID-19 is absent, and if the result is positive, the disease is present.