Question: A serological test is being devised to detect a hypothetical chronic disease. Five hundred individuals were referred to a laboratory for testing. Three hundred diagnosed

A serological test is being devised to detect a hypothetical chronic disease. Five hundred individuals were referred to a laboratory for testing. Three hundred diagnosed cases were among the 500. A serological test yielded 200 positives, of which one-fourth were true positives.

What is the sensitivity, specificity, PPV, NPV, prevalence, and accuracy?

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