Sexually Transmitted Infection — Worldwide/Unknown
The discussion of this paper is fascinating because it highlights the difference between the needs of a test for purposes such as screening, surveillance, and clinical diagnosis.
For the purposes of clinical diagnosis, a test has to be good enough to assist an informed physician. Clearly, “informed” here includes an understanding of the implications of the test, and in particular its positive and negative predictive values.
For screening purposes, a test has to have sufficiently high
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