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Sensitivity and specificity are the probability of a correct test result in subjects
with and without a condition respectively.
Sensitivity (true positive fraction, TPF) measures the ability of a test to detect the
condition when it is present. It is the probability that the test result is positive when the
condition is present.
Specificity (true negative fraction, TNF) measures the ability of a test to detect the absence
of the condition when it is not present. It is the probability that the test result is negative
when the condition is absent.