Pretty Daschund Haloween Chacracters Shirt

It's often meaningless though because of the underlying incidence rate in the population. Let's say 1% of a given population has some sort of disease. If I say "No disease" to every single person I test, I'll have 99% accuracy, but that 99% accuracy means nothing because I haven't distinguished between someone who has it and doesn't have it. Seeing 94% accuracy in a headline is a feel-good story, but statistics don't work like that. Sensitivity is the ability to correctly identify those with the disease while specificity is the ability to correctly identify those without the disease. So if sensitivity is 84%, the dogs were able to identify 84% of all the people confirmed to have COVID in the study.

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